Broken symbols in e.g. contact-notes-editor

Your software
My Mautic version is: 5.2.1 composer based
My PHP version is: 8.2.26
My Database type and version is: mariaDB 10.11.9

Your problem
My problem is: since update from 5.1.1 to 5.2.1 I see broken icons in the internal editor (e.g. at contact->notes->add note) - see in atachment/image.

These errors are showing in the log: none, also with debug = true

Steps I have tried to fix the problem: c:c, m:a:g, rm var/tmp/twig, another pc/browser

Installing a new instance using same local.php and DB dies not solve. Anoter instance on same server works fine. Diff between VHost-Docroots of these two instances does not show any unexpected differences.

How to fix the editor?