Update for my case too. I received a rejection letter for ITIN application last July 13, 2020 (I submitted the tax return and w-7 on February 26, 2020). Got my refund last August 7, 2020 credited to my bank account, and it was higher than the amount I was expecting - higher because I expected them to refund me only based on single filing because ITIN application was rejected, higher too because it was a little bit higher ($20 higher) than the amount expected if ITIN has been approved.
I saw a status on the same day July 13, 2020 on the Where's my Refund tool that my tax return is being processed and refund will be issedu within 21 days. On August 7th, I checked and it said my refund has been approved and will be sent to bank on August 10. However, on the same day, August 7th, I saw it has been credited (though not yet posted and is still a pending item).
I resubmitted my ITIN Application on July 23, 2020. I haven't received any letter from IRS regarding my return.
Hope the above helps.
