here this (Google Drive)
※ A block that has already been light is a block that has been replaced in the current version.
here this file (Google Drive)
yes
now edited to vanilla screenshot.
It's the second most serious problem after the world optimization problem.
Please fix it quickly, and read this issue: https://bugs.mojang.com/browse/MC-239962
The bug is not displayed in Korean even if you set it as you said.
Please refer to the link below for details:
MCL-22079