What version are you running?
Both 4.0 beta 1 and 4.0 beta 2

What's the URL of the page containing the problem?
/r/new/
What steps will reproduce the problem?

New Review Request
Create from a local change click Select Button 
choose one diff create from svn diff



What is the expected output? What do you see instead?
I expected to choose basedir, but the /api/validation/diffs/ api return 400 Bad Request

the body is

{

    "err": {

        "code": 105,

        "msg": "One or more fields had errors"

    },

    "fields": {

        "basedir": [

            "Given repository requires a base directory"

        ]

    },

    "stat": "fail"

}
What operating system are you using? What browser?
OS is macOS Big Sur 11.1

Browser is Chrome 88.0.4324.96
Please provide any additional information below.