What's the expected result of running a tap with --discover and --catalog? Is the data from both sources supposed to be merged? https://sdk.meltano.com/en/latest/cli_commands.html#run-in-discovery-mode-with-a-passed-catalog-file

Generally discovery generates a new catalog, not merged

it look like these two should be mutually exclusive...

In practice they are mutually exclusive flags. When

--discover

is passed, the tap is instantiated without a catalog and exits after printing the discovered catalog, or fails.