Just creating a simple diff in the UI and then trying to create a revision from it with
echo '{ "diffid": 822 }' | arc call-conduit differential.createrevision
fails here with:
[HTTP/500] Internal Server Error {"result":null,"error_code":"ERR-CONDUIT-CORE","error_info":"#1048: Column 'originalTitle' cannot be null"} (Run with `--trace` for a full exception trace.)