Dell MS5320W mouse buttons not recognized in game

I am using the Dell Multi-device Wireless Mouse (MS5320W) to play Warthunder. This mouse has multiple programmable buttons that are, for the most part, working fine. However, the mousewheel itself has 3 clickable buttons: left, right and center. The center click button works fine, however, the left and right do not seem to work in-game. Strangely, while the left and right buttons are recognized and bindable in the controls menu, clicking them in game does nothing. I believe this may be a bug.