https://cdn.discordapp.com/attachments/285816707040280586/607213577350152203/unknown.png

They seem to disappear if i reload chunks but then appear elsewhere:

https://cdn.discordapp.com/attachments/285816707040280586/607213909136637952/unknown.png

Merging with #376 (Flickering grass colours)

I've seen the same thing, appears to be very rare though, looks like more lighting issues. Will need more info and/or a way to reproduce this reliably before I can fix this.