Well - debug logging is enabled by default - if user disabled it then it would need re-enabling.
The logs are removed due to the security issue mentioned in the article showing in the banner Unexpected user token exposure in (Windows) Plex Media Server v1.20.5 through v1.21.1.3830
Please repeat the test - please restart the server with debug logging already enabled and then repeat the test and gather logs using the current version of Plex Media Server https://plex.tv/downloads