DX Thumbies...

And tbh..why would they have an extra hidden 8th gear, when 8 speed hadn't been invented when m732 shifters appeared....in fact 7 was new and trendy!🤣

But it does work as @ishaw says, provided you stop the movement with the derailleur limit screws.
 
Suntour has no shift issuse between 7 and 8 as they maintained the same spacing from 7 to 8 speed cassettes. So switching over makes no odds.

Weirdly this also means the spacing is really really not that far from 8 speed shimano when totalled up....well closer than 7. So 8 suntour runs dandy on 8 sp shimano cassettes (ive done it for 30 odd years).
 
The 8th click in the Shimanos is just the hole for the bearing, that happens to be in about the correct position. That is why the click is not so firm as in the others.
 
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