Possible Bug? Stand-in switches through FC-6 connected to FM9 (non-turbo)

Fat Biscuit

Inspired
I have my FC-6 hooked up to my FM-9 (non-turbo) with a dual momentary switch connected with a TRS cable to the FC-6. Only one of the switches will work. I've tried other cables to rule that out. I've connected the dual switch to the pedal 1 and 2 inputs on the FM9 with a TRS-to-dual-TS splitter cable and both switches work fine. This tells me it's not the switch itself that is the problem. I tried both of the switch inputs on the FC-6 with same result of only one switch working. Is this a known bug with the FC-6?
 
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