Mouse 3 & 4 for PrimeHack MPT not registering

[GoddessSaule]

Been getting into PrimeHack and optimizing my control scheme, but it seems like mouse 3 & 4 (side/thumb buttons) aren't being recognized as being clicked. The control configurator is registering them, but the game isn't at all. I have mouse 3 registered to - and mouse 4 registered to +, and I'm using a Razer Basilisk V2.

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