Using a plugin I set the sky light level to zero at night (this plugin was made by some one else) . When I break/place a block with sky light access its light value is reset to 15, this makes the block act like a torch which breaks immersion.

This affects 1.20.1 and above (haven't tested with 1.20)

This is not a problem on 1.19.4

I talked to the dev, he said its a client side issue

Steps to reproduce

1. Setup a paper 1.20.1 server
2.  Install DarkerNights plugin version 2.5.2
3. Set the time to night
4. Wait for sky light level to drop to zero 
5. Break/place a block and observe the result

Attached are screenshots to demonstrate the effect.

Note versions newer than 2.5.2 will compensate upon block breaking/placing by resetting the sky light back to 0. This creates an annoying flicker.