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If it resets then when you press the shutter or turn it off/on it'll do a big wind on without firing the shutter as if it were trying to pick up the leader at the start of the film so you'd lose a couple frames but then it would work as normal. Supposedly it also won't automatically rewind when you get to the end of the film as it thinks it's only half way through one so you have to hit the button to make it rewind.
In other words, without any remedy or improvement it is slightly annoying but not the end of the world and I seem to have improved it already anyway.
M_V
Rats sorry to jinx it! Does it still wind on with no issues just the counter displays zero?
Sometimes my M5 counter doesn’t reset after taking the bottom off, but most the time I just ignore it until the film is done