Fix is ready and I plan to merge it early this week
We only support Chrome on Android, but the issue here comes from a bug in Firefox implementation of the Visual Viewport API, where it doesn’t update the values when a keyboard pops on the screen, and also on the lack of support for the Virtual Keyboard API in Firefox.
Even with Firefox Android having those bugs, lacking newer APIs, and not being a officially supported browser we spent quite a bit of time on the above PR, which should work around this issue.