With Envelope Options > Distort Appearance on, a path whose Transform
effect has Scale Strokes & Effects or Transform Patterns on, or copies it
with a gradient, was baked with the effect as geometry only: every copy
kept the original's stroke weight, dashes and pattern placement before
the envelope bent it. bake_appearance now makes such a path into the
per-copy art that drawing, export and Expand Appearance already use, and
bakes each copy's strokes into filled outlines from there.