Hardware sweep (Hxx + Ixx) and envelope (EEx) not working together in NSF export

[badgertapes]

When Hardware sweeps are combined with Hardware envelopes, they play back correctly within Dn-FamiTracker and through its WAV export. However, through NSF export, all envelopes when combined with sweeps are cut off to the same length. Attached are two wave files, going through all the envelopes through both WAV and NSF export.

I have not tested any other exports to confirm if this happens with the other available file types.

env + sweep WAV output (.wav file) env + sweep NSF output (.wav file)