All blocks in world render with brightness 0 (stone,grass,etc). Water and lava are not affected. It also happens on all worlds (downloaded and locally created).
Steps to reproduce:
1 Open minecraft,
2 Start world,
3 Lock phone,
4 Unlock phone.
Observed results:
All blocks are rendered black regardless of block light (except water & lava)
Expected result:
All blocks render correctly
Notes:
From my knowledge, it only happens on samsung devices after repeatedly locking the device.

Tested on samsung s9, samsung a53