Okay, but the debug log still displays the 30th of May as the date and doesn't seem to be showing today's instance.
debug.log:
https://pastebin.com/XQjxVDJ5
2021-06-01.log:
https://pastebin.com/FzQbaLEX
There are mods in the server mods folder so the intention wasn't to load a modded world into a vanilla server.
debug.log: (client-side I think, as it's the one in the .minecraft folder and not in the server folder)
https://pastebin.com/2xHcrC3M
Sorry, I'm useless at this.