By the way, Tutor tool does not enable CERTIFICATES_HTML_VIEW in default. And tutor tool will regenerate the file lms.env.json and cms.env.json every time you run tutor local quickstart.
My solution:
step1: download tutor source code git clone https://github.com/overhangio/tutor
Thanks for posting the solution here @JayForTutorForum! I added the CERTIFICATES_HTML_VIEW feature flag to the default env.json files and the fix will be available in the next tutor release (should be v3.6.2).