Lighting bugs around a Minecraft world have become more common unlike other versions. Here are some instances it can be commonly reproduced now:
Seagrass underwater
On caves
I'm not asking to completely fix the bug, but to reduce the chances it can be reproduced.
Yeah, the lighting computations in general seem to still be quite messed up and in need of various fixes and checks, or a proper overhaul. I have seen all from slightly darker lakes, to the good old big black spots (that were allegedly fixed some time ago already), to problems around seagrass in swamps. Those are all separate reports, but in general they just need to pay a really close look into all the lighting computations before 1.13 is remotely done.