This kind of issue has certainly come up before in Dorico for Windows, e.g. here.
The problem is that arguments passed to Dorico at start-up have to be interpreted to see whether they constitute, for example, a list of files to be opened, and certain punctuation characters in the path name (e.g. commas) can throw this off, causing Dorico to think it’s trying to open multiple files and splitting the argument at that punctuation, which obviously won’t work.