Cloning encrypted git repository failed with "bad object"

I tried to git clone my repository from Keybase and got this error:

Cryptographic cloning: (100.00%) 1.70/1.70 MB... done.
fatal: bad object 4d0eab67156ac53dbdf775fdaf18469215343ee4
fatal: remote did not send all necessary objects

my log id: 7c5168e63ec5c0077cbe461c

This was on Windows running git through cygwin, which may or may not be a factor.

Start by reproducing the encrypted clone on Windows through Cygwin and inspect the failure using log ID 7c5168e63ec5c0077cbe461c. Compare the clone behavior and object-transfer errors with a non-Cygwin environment; the work is done when the repository clones without the “bad object” or missing-object errors.

Written by the indexing model from the issue text.