CDN errors trying to download snap "core" from channel "stable"

For what it’s worth, I’ve got this error trying to download core twice:

error: cannot perform the following tasks:
- Download snap "core" (8689) from channel "stable" (received an unexpected http response code (502) when trying to download https://canonical-bos01.cdn.snapcraft.io/download-origin/canonical-lgw01/99T7MUlRhtI3U0QFgl5mXXESAiSwt776_8689.snap?interactive=1&token=1584504000_754c6bcf77cedbc095ac26e830745fb3772e66f2)
##[error]Process completed with exit code 1.

Original log: https://github.com/twpayne/chezmoi/pull/630/checks?check_run_id=515248932

In the short term, I’m trying to disable the use of the CDN with the environment variable SNAPPY_STORE_NO_CDN=1.