If you try to fly in a 1.5 block hight space and you are in F5 / third person mode, you will see your head getting stuck in the block above you. This does not effect your head position in first person mode.
Sneaking pose not showing in flying mode in 1.5 blocks high spaces
Crouching under a slab, then flying will lead to a hitbox error.
Bell bug in creative mode
Going into fly mode in a 1.5 block space (3rd person)
Crouching and then flying under dripleaf makes you visually not in the crouching position
Head inside slab - Shift + fly
Player sneaking animation is not showing when clipping through a block
Double screen bounce with new sneak/crouch changes
In creative, can't use sneak + jump to place blocks adjacent to any block that is clickable
Player sneaking / crouching animation is not shown when flying down in creative and spectator mode