I tested this today on an Avantis and found the same thing as you folks. For all of the reverbs, if you patch the same signal to two inputs, flip the polarity on one, and hard-pan them L/R into a stereo FX send, then nothing comes out of the FX return. In other words, the processing that the FX engine does to the L and R send is identical. I attached a couple photos for reference.
A lot of the other FX, like stereo delays, do process the L and R sends differently.
It’s a bit disappointing that none of the reverbs handle a stereo signal differently than a mono signal, but good to know so we can avoid wasting mixes by using stereo sends for reverbs.
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