verified with 4.5.0-0.nightly-2020-05-11-211039 and HTTP2 is enabled for passthrough and reencrypt (with custom cert) routes.
$ curl --resolve test-reen.example.com:443:a.b.c.d https://test-reen.example.com -k -I
$ curl https://mypass-hongli.apps.hongli-pl039.qe.example.com -k -I
$ curl https://myreen-hongli.apps.hongli-pl039.qe.example.com -k -I
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.