I do seems to remember there were some interactions like this that we never fully understood. There are two cables and four plugs, so you might just consider trying all permutations of plugging them in (there are 12 possibilities I think) and in doing so hopefully find one where both the VOC and O3 sensors are detected and reported. The way they were plugged in when they shipped should have worked though, but I bet you took it apart and put it back together?
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