I had a support ticket on this. It's a known issue internally, and no fix was offered. If I had to guess, it probably has to do with HX Edit not fully supporting HX Effects (this is listed in the HX Edit release notes, but not discussed in the PR material). I'll probably be returning mine, as being able to edit patches from the computer was a major reason behind my purchase. Earliest fix won't be until spring (also in the HX Edit release notes).