In the backend, for extension “Open streetmap”:
Unable to render image tag: File /public/_assets/82f949dc0aec213452344082e33eb19c/Icons/Extension.svg does not exist. (1509741914)
However, the file DOES exist. The image is shown when I do a request in another browser tab.

The same error in the front-end, for the bootstrap_package (it concerns “BootstrapPackage.svg”).
Also, this image does exist.

My “composer” website is a copy of the website I developed with the legacy installation method.
The last works just fine.

Typo3: Version 12.4.15

I inspected the .htaccess, did some changes in the site-definition. Inspected, if the images are really there. I use Typo3 for more than 15 years now, but I cannot find a clue what can be the cause of the errors. Aside, this is my first installation with composer.

I hope someone recognizes this problem and can give me a hint.