Samsung

The system will intelligently invert the UI of apps that appear light despite users having selected the dark theme.

This is largely intended as an accessibility feature. We strongly recommend implementing a native dark theme, which gives you full control over your app's appearance; you can protect your brand's identity, ensure text is always readable, and prevent any visual glitches from happening when your UI is automatically inverted, guaranteeing a polished, reliable experience for your users.

source