I've played the base game a ton before the DLC on an old Xbox360 fightstick. No problems, felt great.

I use a Madcatz TE Fightstick with almost everything. Before the SoR4 DLC dropped, I was playing Guilty Gear STRIVE with no issue.

Booting it up after the DLC dropped, I've experienced some issues:
(Note: I play on default, non-Legacy controls)

-During character select, the RB and LB buttons don't seem to work, thus can't change colors
-The B button functions normally in menus. Once in-game, the B button doesn't seem to work. I can't pick up items (thus, can't progress in Survival mode), but I CAN press B+Y to perform a Star Move.
-I'm not sure if it means anything, but if I start a stage with my fightstick, the character will immediately perform a back attack. I only have A+X for back attack enabled.

Plugging in an Xbox One gamepad doesn't have any of these problems, including the Stage Start Back-Attack.

Thank you!