If you bind the open inventory key to a mouse button, it doesn't allow for closing it after. This relates to MC-145691, although here the 4 and 5 mouse buttons shouldn't trigger other actions or when the cursor isn't pointing in an item and isn't holding anything for 1, 2 and 3.
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violine1101
Thank you for your report!
We're tracking this issue in MC-156810, so this ticket is being resolved and linked as a duplicate.
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