meld won't start on Cygwin: No module named 'meld'

I'm using Cygwin 64 on Windows 10; just updated. Some relevant package versions: * meld: 3.18.0-1 * python3: 3.8.6-1 * python2: 2.7.18-4 I'm also using MobaXTerm's X server (and it works - I can run xclock for example.) When I run meld in a Cygwin bash session (within mintty), I get:

Traceback (most recent call last):
  File "/usr/bin/meld", line 71, in 
    import meld.conf
ModuleNotFoundError: No module named 'meld'

Why is this happening, and how can I get meld to properly run? Notes: * I _think_ this question is on-topic here, but I wasn't quite sure; if it isn't, please comment and I'll move this to SU or whatever. * A related question, which in fact would be even more on-topic here...: Can not start meld on ubuntu 16.04 as error import meld.conf .