The same sort of thing will happen if you use while( /match/g ) { ... } and abort the loop and then execute a similar loop, or when you use another match against the same string within the loop body.
Or if you use while( <$fh> ) { ... } and abort the loop and then execute a similar loop, or when you fiddle the filehandle within the loop body.
Or…
I don’t find each to be any more surprising than those cases.
The actual difference is that these other cases offer a way to save and restore the iterator position (pos, tell/seek), whereas each does not, so it is harder to work with.
Makeshifts last the longest.
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