Update:
I tried switching to BGRT theme and it fixed the issue.
Both start and shutdown splashe screen display correctly and encryption input prompt displays correct locale.
Trying any other non-text splash screen results in full or partial (shutdown only) activation of kubuntu-logo which breaks the prompt.
Update:
I tried switching to BGRT theme and it fixed the issue.
Both start and shutdown splashe screen display correctly and encryption input prompt displays correct locale.
Trying any other non-text splash screen results in full or partial (shutdown only) activation of kubuntu-logo which breaks the prompt.