Since 1.18, mobs can only spawn at light level 0. Having the light overlay still be red when the light level is 7 is a bug.

Optionally, a config option to change when the light overlay should be red could be added and set to default to 0.

There is already a config for that, in Generic -> lightLevelThreshold. And I have changed the default value of it in my code to reflect the 1.18 change. That early build of the mod for 1.18 just doesn't have that change yet.

ok thanks!