Minecraft wiki entry for Development_versions, associated text: MC-249072 – Sculk shriekers replace water blocks.
MC-249087 – The inside texture of mangrove roots darkens when solid blocks are placed adjacent to them.
MC-249111 – sculk_charge cannot be used in /particle command.
MC-249208 – Vines, glow lichens, and sculk veins cannot be placed on the side or top faces of mud.
MC-249315 – Mangrove Roots cannot be composted.
MC-249347 – Map color for mangrove sign and mangrove wall sign is incorrect.
MC-249423 – Player can't open the boat with chests without a ⇧ Shift, even when player can't get into the boat.
MC-249445 – Activated sculk shriekers fail to summon the warden when broken.
MC-249488 – Darkness pulsing option is not saved.
MC-249495 – Inconsistent shading in boat item sprites.
MC-249632 – The Darkness effect is not required for the "How Did We Get Here?" advancement.
MC-249664 – Warden despawns when far away.
MC-249688 – Mangrove stairs come after nether wood stairs in the Building Blocks tab.
MC-249737 – Allay can be pushed around with {NoAI:1b}.
MC-249741 – New advancement names are not properly capitalized.
MC-249785 – Warden can be pushed when emerging and digging.