With flywheel, create, and Starlight Create 1.16.5 rc2 installed, blocks on the ground flicker black then back to their assigned lighting. it is entirely random.

I experience the same problem. I have my own personal modpack and this flickering issue also happens with the commonality of this issue being that I also use Flywheel 0.2 & Starlight RC2. SO i guess it maybe has something to do with flywheel and starlight having some sort of conflict.

Could you post a link to the starlight create compat?

Does this happen without flywheel/create installed?

no, it only happens when Flywheel 0.2 and starlight create compat rc2 are installed together.

https://github.com/AeiouEnigma/Starlight/releases/tag/1.0.0-RC2-Create-2

So far, I have played again using flywheel 0.1.1 + Starlight RC2. No flickering. The flickering only happens on flywheel 0.2 + Starlight RC2

Exact same behaviour for me.

Seemingly this block light misbehaviour has disappeared since 0.2.1, thanks dev.