When playing in survival, both singleplayer & multiplayer, (with/out mods & resource packs), there will be a time where a space in the hotbar will not allow items to be placed in it. Logging out or restarting the game doesn't fix it. The only way I have found to remove that locked space is to manually reset the inventory by dying or clearing the whole inventory by a command. It's quite frustrating to play with.
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Thank you for your report!
We're tracking this issue in MCPE-65815, 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.
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Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
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Thank you for your report!
We're tracking this issue in MCPE-65815, 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.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki