You can no longer jump to drop from the block you are shifting on if you have a block above, despite hitbox suggesting you should be able to

Since MC-2404 was fixed, this probably unintended side effect was introduced. You can see the player hitbox is half a block over the block they're standing on, despite this the player doesn't drop down like how it's always been.

Video titled 1.17.1 shows current behaviour, video titled 1.15.2 shows expected behaviour (how it worked until 20w27a).