User popout broken

[IceCuBear]

Hi!
TL;DR:
User popouts seem to be broken. Been broken for a while now, I hoped for an update, and now I'm here.
Yes, I tried using a “non customized” version of this theme, but still broken (I changed the colours etc.).
Other stuff might be also broken, but this is the only thing I found that is “very” broken.

Thank you in advance.

[IceCuBear]

Since that, the update of 2024/06/18 broke most of the theme.