It's a lighting error, happens sometimes for no good reason.
You could try pressing f3+a which reloads chunks or f3+t which reloads textures - be warned that the game will probably freeze for a bit when you do.
Sometimes putting a torch on that block and then removing it will force an update as well.
1
Hey man idk if you have any modding experience but, if you do man you could take this idea into your own hands. Maybe?
1
I would assume since it is macOS MC files would be in ~/Library/Application Support. Sorry if it is no help.
1
Ok I'll look into it, I don't have an answer atm but keep me updated
1
I would love to help you out my guy but, what do you mean by most recent save?
1
Title