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I opened my inventory and was about to get an item from the first slot to the right
My mouse pointer couldn't access it. the pointer simply disappeared, and the slot lighted up, even though I couldn't be able to get my item, nor put something else in that single slot.
Thank you for your report!
We're actually already tracking this issue in MC-143776, so I resolved and linked this ticket 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 in the future to see if the issue has already been reported.