I've had this issue since the update.
As seen the footage my game just freezes from time to time, after visiting the biome (video 0.00-1.38). It wont end until i disconnect and join back.
On the other hand it doesn't show up when under self made trees. (seen in the videos end 1.39)
(Im the only one having this issue, my friend that i play with doesn't experience this kinda lag when we are in the biome together.)
1. Go to the waterlogged biome
2. wait a moment
3. the lag start