Upgraded server to 1.13, now middle buttons does a weird movement. First it turns your character, usually to look down, but sometimes to the side. Then it picks the block.
For Example: I'm looking at my fence, press middle button to choose a fence block, but then my character looks down, then it picks the floor block
Workaround: assigned pick block to a keyboard button instead
Is this still an issue in the most recent versions (currently that is 1.13.2, or the latest snapshot 18w46a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.