If you place a block (i.e. a lectern) in the same tick that a mob (i.e. a villager) walks onto that block, the block is removed from your hand. However, around 5-10 minutes later, the block reappears in your hotbar/inventory.
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Gamesdw
violine1101
Thank you for your report!
We're tracking this issue in MC-163637, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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migrated
This might happen is your game is not saving at certain time. Try reinstalling Minecraft.
Thanks