While I was playing the new Pre-release 2 version I noticed that if I exit a boat while holding a non tool item my hot-bar would be locked and all items in it unusable until I re-logged I tested this several times to make sure was the cause of the issue.
Environment
Windows 10
8gb ram
i7 7700K
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-186085.
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