— As this is set to no user I have resolved this as incomplete.
You set this to "No User" yourself. I have created MC-270554 now.
Place dirt path underwater
Stand on the dirt path (do not fly).
Sprint
Observed: You do not begin swimming because technically, your feet are not in water, unlike the behavior prior to version 1.17.1.
Expected: You should commence swimming as you did before version 1.17.1.
Position a row of floating water, obstructed from flowing by light blocks, with a one-block gap between the water and the ground (https://bugs.mojang.com/secure/attachment/565784/sound_spamming_machine_1.17.mp4)
Enter the water and stand on the ground
Sprint
Observed: You do not initiate swimming, unlike the behavior before version 1.17.1.
Expected: You should begin swimming but promptly cease, as you are no longer in water, mirroring behavior before version 1.17.1.
Spawn a bee
/attribute @e[type=bee,limit=1] minecraft:generic.attack_knockback base set 5
Hit the bee in survival mode
Observed: Despite the bee having an increased minecraft:generic.attack_knockback attribute, your knockback remained unchanged.
Expected: The attribute should enhance the knockback.
For the other listed mobs, slight adjustments to the command are required, but it should be manageable.
Put the following command in an activated repeating command block:
execute as @p at @s run damage @e[type=!minecraft:player,sort=nearest,limit=1] 1 minecraft:player_attack by @s
Spawn a mob
Observed: The mob did not experience vertical knockback upon first being damaged due to {OnGround:0}.
Expected: The mob should also experience vertical knockback upon first being damaged.
Summon a witch
Place a bell
Ring the bell
Quickly break the bell
Observed: The witch did not acquire the glowing effect.
Expected: The witch should have obtained the glowing effect.
Spawn a villager behind a closed door
/give @p tnt[minecraft:block_state={unstable:'true'}]
Stand in front of the closed door
/summon minecraft:husk ~ ~ ~ {CanBreakDoors:1b}
Replace the door with TNT when the zombie begins breaking it
Wait
Observed: The TNT did not detonate after the husk broke it.
Expected: The TNT should explode once the husk breaks it.
Summon a bee and a blaze underwater
Rejoin the world
Observed: The bee momentarily does not take damage from the water, even though it had been previously damaged by the water before the reload.
Expected: The bee should promptly resume taking damage, similar to the blaze, since it had already been affected by water damage before the world reload.
Yeah, very annoying. Just let me replace my enchanted pickaxe!
Relates to MC-270550 and MC-270551.