[Koha] Missing item type icons in staff client of Koha 22.11.00

Hi Our library uses Koha 22.11.00 with Debian GNU/Linux 11. We chose icons for our item types - these icons show correctly in the OPAC, e. g. the book icon plus the text "book". But in the staff client instead of the icon just the description of the item type is shown - which results showing "book" (instead of the icon) plus the text "book". Thus "book book". No icon. I have tested this also on my demo installation, it's the same. Is this a bug or can anyone give us a hint how to solve the problem? Best wishes: Michael -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch