I called the CRA and the verdict was that they recommended trying 'change my return' instead of 'refile' via turbotax. For some reason, refile through turbotax did not change both line 305 and (if I remember the number right, 5816), only the latter, the income for dependent from $1 to $0. This was apparently enough for turbotax to realize my refund should have been 220 instead of ~2600, but not enough for CRA to recognize the difference in refund. CRA said they think if I do it through 'change my return' in CRA myaccount directly, it should work, but I have to wait until May 24th as I had a 2nd attempted refile through tt today that has to "complete" before I can try again.
