If you are on Minecraft 1.19.4 when I expirienced this isue not that bad if you hold the "f" key your items will switch but then while they are switch and then you hold "q" and "f" at the same time it kind of dupes but not dupping. Oh and for the website it doesn't let me put 1.19.4 so I put 1.20.1
MC-263541
Dupe glitch kind of
Resolved
Invalid
0
This is actually MC-240720. However, since this bug was reported on an outdated version, I'll be resolving this as Invalid: we only accept issues for the latest version. If this occurs in 1.20.1, please add a comment to the linked ticket. Thanks!