out modifier being incorrectly removed

I have the following interface:

public interface IFileLineReader
{
    bool TryReadAllLines(string filename, out string error, out string[] lines);
}

and in a different file, have typed so far:

if (!this.fileLineReader.TryReadAllLines(filename

but if I continue by typing ", out error, " the out modifier is for some reason deleted after typing the final space. This is Rider 2020.3 with no plugins installed. Do I have an incorrect setting, or is this some sort of bug?