If you think about it you always need some version of bod with wedi.
Dw i wedi mynd (I've gone), dw = bod
Ro'n i wedi mynd (I'd gone), ro'n = bod
Bydda i wedi mynd (I'll have gone), bydda = bod
Dylwn i fod wedi mynd (I should have gone), fod = bod
Gallwn i fod wedi mynd (I could have gone), fod = bod
Hoffwn i fod wedi mynd (I'd like to have gone), fod = bod
It is in 'give advice'. The correct version is in there as well, which shows that we had spotted the mistake before and earmarked it for deletion - that didn't happen for some reason.
If we add a corrected version, that then comes up some of the time, lessening the impact of the mistake until we can delete the thing. Duo does not let us correct a mistake in the Welsh once a phrase has gone live, only to delete the phrase completely.