Two items of note, whether they are of interest to you or not depends on you.
First, in one of the first Dorea books, think it's Kevin McMurray's "Deep Descent", the author discusses the manner in which one team wore masks beneath hoods to prevent inadvertant mask loss (due to kicking) while trying to keep the team together in tight places, esp. in low vis.
Anyone who has been in tight places and low vis knows that losing your mask would complicate whatever you tried to do thereafter, and chances of finding your mask again while trying to move with the team and deal with the issues would be statistically pretty slim. (Assuming you didn't have a spare...)
Second, in a number of cave death 'descriptions of the scene' it is noted that the diver was missing a mask. One that I recall more clearly appears in the NACD Journal issue that had Steve Berman's photo on the front, just after Steve died in Ginnie Springs. In the back is a description of a body recovery in which the diver's mask was found some 20-30 feet from the body.
While any conclusion would be speculative, given the fact that emergency response is often a high-stress situation it would seem that losing one's mask while dealing with other issues could only complicate matters further.
If wearing a mask beneath your hood works for you, then great.
Aside from it being one less thing that may go south for you, it isn't likely to impact the team negatively in any significant way.
And some statistics would tend to suggest that doing so might pay dividends should you ever find yourself in tight quarters and low vis, particularly if you're already having a bad day.
FWIW. YMMV.