[com.ubs.Paymit.android] Heavy graphical flickering in UBS Twint app, inputs not registered reliably

[maltherd]

Affected app
Name: UBS Twint
Package id: com.ubs.Paymit.android

Describe the bug
The app heavily flickers from startup : the displayed graphics get shown and then redrawn very often, which appears to cause lag. This flickering affects the top bar too, and inputs are not reliably registered.

I tried downloading and running another Twint app (the Raiffeisen Twint app) and this issue did not appear.

The issue did not appear in previous versions either, I have used the UBS Twint app for months at a time with no issue.

To Reproduce
Steps to reproduce the behavior:

1. Open the UBS Twint app.

Expected behavior
The screen does not flicker, and the inputs are responsive.

Screenshots
Video of the issue. Sadly Twint does not allow screen recording, so I had to make this scuffed video instead. The quality is not good but the issue is visible. You can see I have trouble typing in the digits.

System
Android Version: 13
Custom ROM: /e/os 2.4.1-t-20241009439851-official-FP4 (The problem did occur on the latest stable version too. Here, I tried the unstable one, but no luck.)

microG
microG Core version: 0.3.2.240913-22 (43f9740)
microG Self-Check results: All ticked

Additional context
This might be an /e/os issue and not a micro-g one, but in doubt I still posted here. Thank you for your help!