Damaged UI after reopen from background

[matthesatox]

Describe the bug
The UI is damaged in dark mode after reopen the app from background. Please see attached screenshots.

To Reproduce
Occurrence: rarely
Steps to reproduce the behavior:

1. Open app and switch appearance to dark
2. Put app to background
3. Lock your phone
4. Wait some minutes
5. unlock your phone
6. Open the app again

Expected behavior
UI should be fine

Screenshots

App information (please complete the following information):

• App version: 0.700.2 (518)
• Plugin version: [e.g. 0.4.0]
• Delta Chat Core version: [e.g. 0.40.0]
• Flutter version: [e.g. 1.0]

Smartphone (please complete the following information):

• Device: iPhone 11 Pro Max
• OS: iOS 13.5

Additional context
log_20-05-28_14-45-01.txt

Internal Bug Tracker.

[Boehrsi]

We encountered this one once during development and testing, but we were never able to reproduce it. Did you saw this more than once?

[matthesatox]

No, unfortunately not