stage2: slice behavior test passes, just has diff behavior from stage1

This is from discussions from #11249. The stage2 behavior is correct and
is strictly more accurate, so we'd prefer to keep it. In that case, I
modified the behavior tests to have the conditional between
stage1/stage2 and get this test passing.
cb6364624fMitchell Hashimoto committed on 3/22/2022, 11:56:10 PM· committed by Andrew Kelleyparentb74f292
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