PWAs with Lemmy 0.18 instances very crashy on Android/Fenix fork

Inb4 I know I have an old phone with low storage and old Android 9 and a slightly outdated Fenix fork (IceRaven/Fenix 112) with a bunch of extensions and the problem could be in any of these. Just wanna know if it's definitely on my end or maybe not. Because I never have this kind of problems with any other web site.

Anyway. I tend to use permanent Private mode apart from a couple PWAs, including some Lemmy instances. My "home" lemmy.world with 0.17.4 works well enough.

But I just realized that when using instances on 0.18 like lemmy.ml or lemmynsfw, minimizing the PWA (going to phone home screen) crashes the entire browser, including any other windows.

So, is it just me?

For comparison, I tried it on Bromite (yes I know it's not developed anymore): using the add home shortcut for 0.17.4 lemmy.world just indeed adds a browser shortcut. With 0.18 instances, the shortcuts make Bromite act like proper PWAs without the address bar etc. But not crashing.