This happens when you switch items in your hud while ringing a bell and I was just messing about in my world and I came across this glitch then recorded it and this was made easy because the nintendo switch can record 30 seconds in the past and this was more than enough to show this issue
MCPE-104420
Switching items while ringing a bell shows different item in the hud and the hand
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Thank you for your report!
We're actually already tracking this issue at MCPE-69865, so I will resolve and link this ticket as a duplicate.
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