My Google Tag Manager seems to reference an unknown trigger. I have several changes I’d like to get published but this error prevents me from doing anything

The “unknown trigger” link points to https://tagmanager.google.com/#/container/accounts/XXX/containers/XXX/workspaces/3/triggers/19

but the trigger of ID 19 does not exist (it even says not found in the bottom corner, and opens a broken page where I cannot really fix anything) and the page URL is automatically set t the workspace

Any idea how to fix this ?

To give you more context (although I’m not sure i’ts related) I was trying to setup a meta Pixel using the Meta wizard. At some point I have granted access so meta could push some tags on my behalf, but the workspace was dirty (I had other changes before). Meta created a bunch of tags/variables/triggers. I’ve tried to remove them, but the error remains. I have several changes I don’t want to discard (and I get the feeling that even if I did, it would not change much…)