CountTrackEnvelopes() / GetTrackEnvelope() include FX envelopes

There is no way to know which track envelope is Volume/Pan/Width and which are FX parameters.

If there are 3 FX envelopes on track with active volume and pan envelopes, they will be indexed as envelopes #2 #3 #4. Expected - they will not be indexed.

Problematic script: mpl_Duplicate envelope points

Reproducing:
add track, enable volume envelope, add any plugin, open envelope for any parameter

Code:

---

track = reaper.GetTrack(0, 0)
count = reaper.CountTrackEnvelopes(track)

---

> count = 2
expected: count = 1 (only volume envelope)

CountTrackEnvelopes() / GetTrackEnvelope() include FX envelopes