Hi,I do not think that that is the only reason to send file to PSU. I know other people who have first name blank and whole name on last name field and they got requested fingerprints and then rest of processing was normal.
I don’t do know anything about PSU so I can’t comment.
Since you applied in September 2018, I would not worry about file processing speed yet, just have patience and if you don’t hear anything from IRCC until mid summer then you can call them and check what’s going on, Unless you are overly worrisome.
Good luck.
Have you applied for name change already?
I am in the same situation, but i am still thinking if i should go for a name change (split actually) before applying for citizenship or after.
As in your case, if you change it now, do you have to change it on your citizenship certificate as well or just with the legal name change certificate you can get it modified on your new Canadian passport.