Open a post, then touch the three dots at the top to open the menu, then go to sort and select the one you want.

For some reason, lemmy.world dont like the old one, but all the others work

After this, the part where he trespass and try to open the locked door without any authorization got even more creepier... :|

Just tried on some browsers in private/incognito mode and all worked when not logged in.

But then I logged in, and the problem appears again. After some testing, I found that the problem seems to be on the default comment sort.

When set to old (which was my default one) I have the error, but when using any of the other options (new, top, hot), the comments display correctly.

EDIT:

The same happens when using mlmym.org to visit the lemmy.world instance. When set the comment sort do old, I got the error. Changing to new, it works.

But using mlmym.org on others instances I tried, it always works even when using the old as default.

Same issue here, checking on devtools there's an error 500 on the main page load

That info is public available on kbin (this post was federated from kbin.social).

On lemmy, I believe only the admins have access to this info by looking at the database itself.