I usually base bombing in air realistic battles in this section i cant see the estimate base bombing value i dont know if is it bug or not so many times it happens to me.
Might have something to do with the loadout having missiles. Just make a loadout without the missiles if you want to check base damage.
I was a bug, it was fixed a little while ago though and it seems to be working fine for me since then.
One thing to check is the game mode that is showing as selected in your hangar. I found that if you’re in a game mode such as Naval AB/RB, and go in to your research tree and look at planes and secondary loadouts, then the Base Damage doesn’t show.
(Ground AB/RB looks similar, but I haven’t checked around too much)