This may be a longshot, as it looks like support/contributions to Course Templates has ended, but we're running that plugin. (v. 2019120800) on Moodle 3.9.2+ (Build: 20201016) (2020061502.08), running the Fordson Theme.
We're able to successfully create course templates with the plugin, but when creating a new course from a template, the "Continue" button turns into "Creating" once pressed, and then just hangs there indefinitely. The course we're duplicating is only full of a handful of Embeded (not hosted on our server) videos, a test, and a couple of PDF downloads. So the size of the course shouldn't be an issue.
Has anyone else run across this when using the "Course Templates" plugin? If not are there better course template options than this plugin that looks to have stopped being contributed to over a year ago.