Lawrence Geyer

My family plays on three different Macs - the latest iMac, the 2nd most recent iMac & a 2018 MacBook Pro//OLED bar laptop.   Same issue described above started occurring in 1.14.3     V Sync doesn't help. 

Also with the release of 1.14.3, lots of other game playing oddness — mine cart travel is not smooth, but rather very herky-jerky and feels like it's taking longer.  Also issues with blocks reappearing after they've been broken and lots of general lagginess.  All of this in on the Realms.

This exact same issue (light sources not working) just started happening within my family's realm's based world yesterday, 5-23-19.   Version 1.14.1 vanilla .  This is for all light sources, not just torches.  It includes naturally occurring sources such as sunlight and lava pools.  This is not just a visual bug, as mobs are spawning in the unexpectedly dark areas. 

I "reset" some of the effected areas by either breaking then replacing sources such as torches.  Also went around with a lava bucket briefly placing lava then picking it back up.   This temporarily reset light sources to function as expected but both after returning from the nether and also quitting // restarting the game the issue returned.    

It makes the game absolutely unplayable in certain areas. 

A couple of examples can be seen in the world at coord's 330/76/1848 & 329/69/1845.

I've never  reported a bug before – so sorry if this is wrong file attached – I spent 15 minutes searching your site for an explanation as to what to attach and no explanation was readily found.