We are experiencing some inconsistent loading of CSS on an Odoo database hosted on Odoo.sh. When sending invoices in bulk the CSS randomly fails to load for a few invoices and then loads fine again after a while. During a bulk process of invoices I tracked down that the URL of the web.report_assets_common.min.css switch on 12:05:22 resulting in a 404 when requesting the old URL. It seems that Odoo keeps requesting the old URL while generating the invoice PDFs but after a while yet another URL is used and the CSS is loaded again in the PDF report.

...
[28/May/2024
12:05:16]
"GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 200
- 4 0.001 0.004
[28/May/2024 12:05:19]
"GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 200 - 4 0.001 0.004
[28/May/2024 12:05:22]
"GET
/web/assets/227861-45bea67/web.report_assets_common.min.css HTTP/1.0" 200 - 9 0.004 0.008
[28/May/2024
12:05:227
"GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 - 9 0.007 0.005
[28/May/2024
12:05:231
"GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 - 2 0.000 0.003
[28/May/2024
12:05:25]
....
[28/May/2024
12:09:34]
"GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 - 3 0.001 0.003
128/May/2024
12:09:571
"GET /web/assets/227998-c5247d9/web.report_assets_common.min.css HTTP/1.0" 200 - 8 0.003 0.005
[28/May/2024
12:09:571
"GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 - 8 0.004 0.005
[28/May/2024
12:09:587
"GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 -
3 0.001 0.003
[28/May/2024
12:10:52]
"GET /web/assets/227998-c5247d9/web.report_assets_common.min.css HTTP/1.0" 200
- 4 0.001
0.007

This is the raw logs around the time the URL is switched.

[28/May/2024 12:05:19] "POST /web/dataset/call_kw/stock.picking/read HTTP/1.0" 200 - 54 0.030 0.022
[28/May/2024 12:05:19] "POST /web/dataset/call_kw/stock.move/read HTTP/1.0" 200 - 25 0.013 0.020
odoo.addons.base.models.ir_actions_report: The PDF documents 'VF_2024_07050.pdf' are now saved in the database
odoo.addons.base.models.ir_actions_report: The PDF report has been generated for model: account.move, records [86727].
[28/May/2024 12:05:19] "POST /web/dataset/call_kw/studio.approval.rule/get_approval_spec HTTP/1.0" 200 - 12 0.006 0.008
[28/May/2024 12:05:19] "POST /mail/thread/messages HTTP/1.0" 200 - 26 0.013 0.010
[28/May/2024 12:05:19] "POST /mail/thread/data HTTP/1.0" 200 - 12 0.020 0.013
[28/May/2024 12:05:19] "POST /web/dataset/call_kw/iot.device/search_read HTTP/1.0" 200 - 3 0.002 0.005
[28/May/2024 12:05:19] "POST /web/dataset/call_kw/iot.device/search_read HTTP/1.0" 200 - 3 0.002 0.007
[28/May/2024 12:05:19] "GET /web/assets/176874-d6fa3f9/web.report_assets_pdf.min.css HTTP/1.0" 200 - 4 0.001 0.004
[28/May/2024 12:05:19] "GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 200 - 4 0.001 0.004
[28/May/2024 12:05:19] "GET /base/static/img/bg_background_template.jpg HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-Bla-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:19] "POST /web/dataset/call_kw/iot.device/search_read HTTP/1.0" 200 - 3 0.002 0.006
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-Bol-webfont.woff HTTP/1.0" 200 - 0 0.000 0.002
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-Lig-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-Reg-webfont.woff HTTP/1.0" 200 - 0 0.000 0.002
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-Hai-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-RegIta-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-LigIta-webfont.woff HTTP/1.0" 200 - 0 0.000 0.002
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-HaiIta-webfont.woff HTTP/1.0" 200 - 0 0.000 0.002
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-BolIta-webfont.woff HTTP/1.0" 200 - 0 0.000 0.002
[28/May/2024 12:05:19] "GET /web/static/fonts/lato/Lato-BlaIta-webfont.woff HTTP/1.0" 200 - 0 0.000 0.002
[28/May/2024 12:05:19] "POST /web/action/load HTTP/1.0" 200 - 12 0.005 0.006
[28/May/2024 12:05:20] "GET /prijsstijgingen HTTP/1.0" 200 - 7 0.004 0.011
[28/May/2024 12:05:21] "POST /web/dataset/call_kw/sale.order/web_search_read HTTP/1.0" 200 - 26 0.030 0.085
[28/May/2024 12:05:21] "POST /websocket/update_bus_presence HTTP/1.1" 200 - 12 0.005 0.031
[28/May/2024 12:05:21] "POST /websocket/peek_notifications HTTP/1.1" 200 - 9 0.003 0.005
[28/May/2024 12:05:21] "POST /sales/sale_quotation_onboarding_panel HTTP/1.0" 200 - 1 0.000 0.003
[28/May/2024 12:05:21] "POST /web/dataset/call_kw/iot.device/search_read HTTP/1.0" 200 - 3 0.002 0.005
odoo.addons.base.models.ir_actions_report: The PDF documents 'VF_2024_07052.pdf' are now saved in the database
odoo.addons.base.models.ir_actions_report: The PDF report has been generated for model: account.move, records [86869].
[28/May/2024 12:05:22] "GET /web/assets/176874-d6fa3f9/web.report_assets_pdf.min.css HTTP/1.0" 200 - 4 0.002 0.006
[28/May/2024 12:05:22] "GET /web/assets/176874-d6fa3f9/web.report_assets_pdf.min.css HTTP/1.0" 200 - 5 0.002 0.006
[28/May/2024 12:05:22] "GET /web/assets/227861-45bea67/web.report_assets_common.min.css HTTP/1.0" 200 - 9 0.004 0.008
[28/May/2024 12:05:22] "GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 - 9 0.007 0.005
[28/May/2024 12:05:22] "GET /base/static/img/bg_background_template.jpg HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:22] "GET /base/static/img/bg_background_template.jpg HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:22] "GET /web/static/fonts/lato/Lato-Reg-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:22] "GET /web/static/fonts/lato/Lato-Lig-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:22] "GET /web/static/fonts/lato/Lato-Hai-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:22] "GET /web/static/fonts/lato/Lato-Bol-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:22] "GET /web/static/fonts/lato/Lato-Bla-webfont.woff HTTP/1.0" 200 - 0 0.000 0.001
[28/May/2024 12:05:22] "POST /web/action/load HTTP/1.0" 200 - 15 0.007 0.010
[28/May/2024 12:05:22] "POST /web/dataset/call_kw/purchase.order/get_views HTTP/1.0" 200 - 103 0.035 0.059
[28/May/2024 12:05:22] "POST /web/dataset/call_kw/purchase.order/web_search_read HTTP/1.0" 200 - 11 0.008 0.025
[28/May/2024 12:05:23] "POST /web/dataset/call_kw/purchase.order/retrieve_dashboard HTTP/1.0" 200 - 16 0.011 0.007
[28/May/2024 12:05:23] "GET /web/assets/171950-c640072/1/web.assets_frontend_minimal.min.js HTTP/1.0" 200 - 4 0.001 0.004
[28/May/2024 12:05:23] "GET /web/image/res.users/12/avatar_128 HTTP/1.0" 304 - 13 0.006 0.009
[28/May/2024 12:05:23] "GET /web/image/res.users/6/avatar_128 HTTP/1.0" 304 - 22 0.009 0.014
[28/May/2024 12:05:23] "GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 - 2 0.000 0.003
[28/May/2024 12:05:23] "POST /web/dataset/call_kw/iot.device/search_read HTTP/1.0" 200 - 16 0.008 0.007
[28/May/2024 12:05:23] "POST /websocket/update_bus_presence HTTP/1.1" 200 - 12 0.006 0.025
[28/May/2024 12:05:23] "POST /websocket/peek_notifications HTTP/1.1" 200 - 9 0.002 0.005
[28/May/2024 12:05:23] "POST /websocket/peek_notifications HTTP/1.1" 200 - 8 0.003 0.007
[28/May/2024 12:05:24] "GET /shop/0000-4164-duco-co2-regelklep-30m3-u-focus-238952?category=249&order=list_price+desc HTTP/1.0" 200 - 76 0.026 0.06│
[28/May/2024 12:05:24] "POST /websocket/update_bus_presence HTTP/1.1" 200 - 11 0.006 0.025
[28/May/2024 12:05:24] "POST /websocket/peek_notifications HTTP/1.1" 200 - 8 0.003 0.005
[28/May/2024 12:05:24] "POST /websocket/update_bus_presence HTTP/1.1" 200 - 11 0.006 0.024
[28/May/2024 12:05:24] "POST /web/dataset/call_kw/iot.device/search_read HTTP/1.0" 200 - 3 0.002 0.005
[28/May/2024 12:05:24] "POST /websocket/peek_notifications HTTP/1.1" 200 - 8 0.003 0.007
[28/May/2024 12:05:24] "POST /websocket/update_bus_presence HTTP/1.1" 200 - 27 0.011 0.027
[28/May/2024 12:05:24] "POST /web/dataset/call_kw/iot.device/search_read HTTP/1.0" 200 - 12 0.005 0.012
[28/May/2024 12:05:24] "POST /websocket/peek_notifications HTTP/1.1" 200 - 8 0.003 0.005
[28/May/2024 12:05:24] "POST /websocket/update_bus_presence HTTP/1.1" 200 - 12 0.006 0.025
[28/May/2024 12:05:24] "POST /websocket/peek_notifications HTTP/1.1" 200 - 9 0.003 0.005
[28/May/2024 12:05:24] "POST /web/dataset/call_kw/sale.order/web_search_read HTTP/1.0" 200 - 31 0.037 0.060
[28/May/2024 12:05:24] "POST /websocket/update_bus_presence HTTP/1.1" 200 - 21 0.009 0.025
[28/May/2024 12:05:24] "POST /websocket/peek_notifications HTTP/1.1" 200 - 8 0.003 0.006
odoo.addons.base.models.ir_actions_report: wkhtmltopdf: Exit with code 1 due to network error: ContentNotFoundError
[28/May/2024 12:05:24] "POST /websocket/peek_notifications HTTP/1.1" 200 - 9 0.006 0.006
odoo.addons.base.models.ir_actions_report: The PDF report has been generated for model: account.move, records [86977].
odoo.addons.base.models.ir_actions_report: The PDF report has been generated for model: stock.picking, records [50693].
[28/May/2024 12:05:25] "GET /web/assets/176874-d6fa3f9/web.report_assets_pdf.min.css HTTP/1.0" 200 - 4 0.001 0.004
[28/May/2024 12:05:25] "GET /web/assets/227768-c5247d9/web.report_assets_common.min.css HTTP/1.0" 404 - 2 0.002 0.004

We already set the report.url, web.base.url and web.base.url.freeze in the system parameters but this still happening randomly.