Reproduction steps

1. Create a new sub-wiki with:
   1. "foo" as ID
   2. standard flavour
   3. other parameters default
2. When creation is finished, delete it

Result

Here's the log message in my local instance case:

2026-05-22 12:28:24,924 [qtp1003752023-55 - http://localhost:8080/xwiki/bin/view/WikiManager/DeleteWiki?wikiId=foo] WARN  o.x.c.i.DefaultCSRFToken       - Secret CSRF token verification failed (token: [null], stored token: [zYGjmAmDzJhXxYT0wUl5xA]) 

Expected result

No warning logged