Mobs spawn on Mangrove Roots

Mobs spawn on Mangrove Roots. Bug appears to happen from Snapshot 1.19-pre2 onwards and got discovered on Philzas stream. Clip: https://clips.twitch.tv/DeliciousPeacefulGnatBrainSlug-ezmpDlkc38lsCYwd

Versions where found:

Snapshot 1.19-pre2

1.19

1.19.1

1.19.2

1.19.3

1.19.4 Pre-release 2

 

How to recreate: Create a superflat world with Mangrove Roots on top. Then set time to night.