The bug
The spyglass and your hand can glitch through your body when in a boat.
How to reproduce
Obtain a spyglass and enter a boat
Turn all the way to the left or right and change your perspective (default F5) twice
Expand the spyglass
❌ The arm of the player passes through its head
Related issues
Attachments
Comments


take a brighter screenshot because I can't see anything.
The spyglass being detached from the head is not exclusive to boats and won't be fixed, see MC-205791
Can confirm in 21w07a. Closely relates to MC-100000.
Can confirm in 21w11a. Video attached.
Can confirm in 21w13a.
Can confirm in 21w14a.
Can confirm in 21w16a.
Can confirm in 21w17a.
Can confirm in 1.17.

Can confirm in 1.17.1.
Can confirm in 21w40a.
I am able to confirm this behavior in 21w43a. Here are some extra details regarding this problem.
The Bug:
The arms of players can pass through their heads when using spyglasses whilst riding boats.
Steps to Reproduce:
Obtain a spyglass and place down a boat.
Begin riding the boat and switch into third person. (Hit F5 twice).
Turn your head clockwise or counter-clockwise as far as you can, and then use the spyglass.
Take note as to whether or not the arms of players can pass through their heads when using spyglasses whilst riding boats.
Observed Behavior:
The arms of players can pass through their heads when using spyglasses whilst riding boats.
Expected Behavior:
The arms of players would not be able to pass through their heads when using spyglasses whilst riding boats.
Can confirm in 1.18.1.
Can confirm in 1.18.2.
Can confirm in 1.19 and 22w24a.