Crushing wheels will function if one side is rotating towards the other, the other wheel does not need to be rotating or can be at a slower opposite rotation speed.

Mod Version: 1.16.5_v0.3.1b

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This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.

after experimentation, it seems that that this is only the case in this setup (I am facing east) if I powered the other right wheel but not the left wheel, ir would not function, however it will still function even if the right wheel is spinning faster than the left.

it seems as though the time taken to crush is controlled by the left wheel, while the right was spinning faster (at max speed) it took it's time to crush

Sorry for the confusion, hopefully this image helps: