Backport PR #36613 on branch 1.1.x (BUG: Fix unordered cut with Series labels)
Backport PR #36613: BUG: Fix unordered cut with Series labels
web and docs now passing after restart (can't start ci/checks and ci/web and docs independently) may consider splitting. failure unrelated. see https://github.com/pandas-dev/pandas/pull/36396#issuecomment-695195148