case over signum of Integer is incorrect in GHC 9.2

Summary

case over signum of Integer returns an incorrect result.

Steps to reproduce

GHCi, version 9.2.0.20210331: https://www.haskell.org/ghc/  :? for help
ghci> signum (-1 :: Integer)
-1
ghci> case signum (-1 :: Integer) of 1 -> "FOO"; -1 -> "OK"; 0 -> "BAR"; _ -> "FAIL"
"FAIL"

Expected behavior

I would expect the second line to return "OK".

Environment

GHC version used: 9.2.0.20210331

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