This is now merged into the mainline, thanks everyone for testing!
We also decided that the animation and recording exports on Android will be included into Krita 5.3, rather than waiting until the 5.4 release. It won’t be in 5.3.3, since that release is already cut, but 5.3.4 should have it when it comes out. If you don’t want to wait until then, it will also show up in the Krita Plus nightly release in the coming days, which you can find when you scroll down on the downloads page of krita.org under “Krita Plus Nightly Builds”.
If you find further issues, post it in this thread, create a new thread or send me a direct message through the forum.