Was surprised I started mixing up left and right after I broke my right-hand wrist while biking.
Turns out I subconsciously associated “right” for the direction my stronger hand was on, and once my left hand started feeling like the more dominant one during recovery - my brain would automatically choose that “right” should be on my left-hand side instead, until I actively thought about which direction is which.
This gradually decreased out as my right hand recovered and got back to being the dominant one over the next few years, but was eye-opening what shortcuts my brain uses for such basic things.
I guess I just felt that “right” is my stronger hand direction, “left” is my weaker hand one. Now, after several years of recovery I feel it almost the same way as before, so my mind makes the same shortcut instead of thinking for a second about it. But if I ever feel the balance of my stronger-weaker side tipped (e.g. right hand has fallen asleep) I guess it’s thinking time again.