Probably has the same cause, but I've seen cases with other bugs where the solution was not generalized and only corrected one of the related cases. A case in point is the issue that was present last year where MAGI was being calculated incorrectly for the deduction for a traditional IRA contribution and for a Roth IRA contribution when there was also a distributions from an inherited IRA. Only one of these MAGI calculations was corrected with an update, probably because the problem was not generalized properly:
https://ttlc.intuit.com/community/taxes/discussion/magi-calculation-for-roth-contribution/00/3205030
Given the developer's history of being shortsighted with respect to understanding the underlying cause of a problem, there's a good chance that the change to correct the 7D case will not correct the 4D case. The fix needs to involve not asking the question if code D is present, but it would not surprise me if they apply the fix only to the case where both code D and code 7 are present.
