When you are moving in a boat and jump out, your character acts like they are still in the boat. You can not use tools, place blocks, eat, etc... You can't even get back in the boat.
Logging out then back in or travel through a portal returns you to normal.
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Reproduce by jumping out of a boat while it is still moving (pressing 'w'). Visual of hand is not there and cannot see anything in the hand. Unable to 'use' items, however can dig. On digging the tool is rendered briefly.
I could reproduce the issue with all directions and it only applies to boats, when your hand starts going into the rowing animation is when the issue appears. If you weren't rowing before going off the boat the issue doesn't seem to appear.
I cannot reproduce.
Can reproduce, pressing the forward key while unmounting is the trigger, if the boat is stopped before exiting work correctly.
can reproduce while moving at "walking pace" can reproduce while "sprinting" in a boat then getting out while in that state with my hands hidden. i can mine blocks but i cant damage the boat, i havent tried attacking a fish yet. if i stop fully it works normally.
Can easily reproduce, seems to be an issue because the game 'puts away' your hands when moving in a boat, preventing you from placing blocks while moving. stopping moving puts your hands back up and will not trigger the glitch when exiting the boat. However, exiting while moving will trigger the glitch. On a similar note, moving in a boat seems to move the players hand back to the point where it isn't seen. When this glitch is trigger and you hit (left click) with whatever is in your hand, the model for said item appears where your hand is, so it is barely visible.
Tip: Quit and Enter your world and you should be able to do everything. Worked for me. (it will not resolve the issue with the boat though). This bug is kinda annoying. :v
added a Vid to the Attachments. annoying bug
If you stop before exiting the boat it wont happen. reloading the world fix it

Can confirm in 1.16 pre2
Does this also apply to minecarts?
Just confirmed in 1.16 pre-2 that minecarts do not cause this issue.
Dying also fixes the problem, but I don't recommend it. Problem also occurs while moving in any direction when you exit the boat. Occurs on both land and water.
just happened to me in pre release 2
reentering the world solves the problem in pre 2