Slash voices failing during manual condensing

Hello! A I’ve noticed some strange interaction between slash voices and manual condensing (see attached file, m. 207, full score, bassoons). The slash voice appears as intended in write mode, but reverts to a pitched note in Engrave mode. My workaround for now is to just abandon using the slash voices in these cases and enter notes and change noteheads manually. Let me know if I’m missing something!
America_Transcription copy.dorico.zip (3.9 MB)

I don’t think it’s possible to condense slash voices at the moment. Here is a workaround if you don’t care about playback:

I think these suggestions will work. Thanks.