Which Shimano pedals have reverse threaded bearing adjustments?
I found the answer in this document: https://si.shimano.com/pdfs/dm/DM-PD0002-07-ENG.pdf#page27

NOTE:

Right-hand thread: Black-colored (without slit)
If the fitted lock nut is black-colored (without slit), the cone and the lock nut have a right-hand thread.
Left-hand thread: Black-colored (with slit)
Silver-colored If the fitted lock nut is silver-colored or black-colored (with slit), the cone and the lock nut have a left-hand thread.”


I pulled both pedals apart again, and lo and behold, the left pedal’s locknut is a brown color, while the right pedal’s is plain silver.