`-ddump-json` combined with `-ddump-to-file` does not save files

Summary

The documents suggest that -ddump-json combined with -ddump-to-file should result in files being created like prefix.dump-json. Instead, JSON is dumped to stdout and no files are created. -ddump-simpl, on the other hand, works as expected.

Steps to reproduce

[mwb-dev:~/mercury/other-backend]$ cat > Test.hs
main :: IO ()
main = mempty
^D

[mwb-dev:~/mercury/other-backend]$ ghc -ddump-json -ddump-to-file -ddump-file-prefix=FooBar Test.hs
{"span":null,"doc":"[2 of 2] Linking Test [Objects changed]","messageClass":"MCOutput"}

Expected behavior

I would expect a file FooBar.dump-json to exist. But it does not.

Environment

• GHC version used: 9.4.4

Optional:

• Operating System: MacOS 12.6.3 (21G419)
• System Architecture: aarch64