TLS certificate Issues on the Fenix 5 Plus

I recently posted a report related to a Sectigo SSL certificate's not validating on Fenix 7 / Epix gen 2 devices.

For the Fenix 5 Plus, things seems things much worse: Sectigo doesn't work, Let's Encrypt doesn't work, Amazon's root certificate used for Heroku apps doesn't work, and most surprisingly and importantly for me, the Digicert used by some S3 buckets isn't accepted. This is really surprising since Digicerts typically seem to be the gold standard (as far as these things go), so if that's not accepted, it seems like things have gone terribly wrong.

The CheckTLS app can be used to verify this, but you may want to patch it with other interesting root certs to verify their compliance.

I know the Fenix 5 Plus worked well in the past, but SSL certificates are a moving target, and there have been several high-profile moves recently. Amazon being the big one: going from Digicert to their own certs (but appearing to retain Digicert in some cases?).