Ravines now support lava layers at the bottom of them. We will be updating the overworld soon, stay tuned in discord news for when its updated
Lava is now supported in carving, this is a change to the way the mantle stores information so it may be wise to back up worlds generated on 1.8 before loading them up.
Fixed an issue causing strongholds to always spawn at 0,0
In studio worlds, Iris will now properly tell you what cave / ravine biome you are in (along with /iris std editbiome)
Fixed a lot of problems with the studio scoreboard (doesnt flash anymore etc)