When I rapidly place blocks by pressing a combination of W, left-click and right-click, often I start automatically moving. What I mean by this is that even when I'm not pressing anything, I still continue to move. Pressing any of the WASD keys doesn't solve it. I have to press Esc and then return to game.
Related issues
duplicates
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bugi74
migrated
Plenty of duplicates, leading to MC-886. EDIT: except that seems there the remedy was to just hit the relevant movement key again, which apparently doesn't work here.