Created attachment 161557 [details]
the category view from the viewer

SUMMARY
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To successfully assign a token in the viewer, you need to use capital letters (caps lock). Otherwise, the token gets assigned as lower case letter, which does not show in the tokens list (but in the category list in viewer and thumbnail view). It is even possible to assign a lowercase and an uppercase token for the same letter "h" and "H". Then the token does not show in the tokens list.
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STEPS TO REPRODUCE
1. Start viewer and hit crt-t to allow assigning tokens
2. hit any letter, eg. "h"
3. The hint "Token H" appears and disappears and the letter "h" is listed in the category as token
4. exit the viewer and go to the start page
5. select Tokens

OBSERVED RESULT
* The newly assigned token is not in the list.
* But in thumbnail view and viewer, the letter "h" is listed as token
* When assigning "h" and "H" as tokens, both are listed in the categories in thumbnail view and viewer but "H" is not shown in the list of tokens.

EXPECTED RESULT
* The token should have been assigned as uppercase "H" regardless of caps lock setting and should always appear in the token list (the one reachable from the start page). That would be the old behaviour - see https://bugs.kde.org/show_bug.cgi?id=474307 and would be consistent with assigning tokens in the thumbnail view.

SOFTWARE/OS VERSIONS
KPA: v5.11.0-92-g28815029
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8 

ADDITIONAL INFORMATION