Publish/Submit for Review and confirm.Both post content and meta boxes save. Message comes up confirming course was saved.
Spinner keeps spinning. Meta box request ends with error. Meta box content is not saved
PHP 7.2
WordPress 5.1
Sensei 1.12.3 and 2.0.1
Chrome


After a bunch of digging, I've determined that this is a bug in Gutenberg. I submitted a PR - https://github.com/WordPress/gutenberg/pull/15375
That said, I consider this to be a pretty serious issue for Sensei, and it will likely take a while for that PR to make its way into WP core. I'll put together a PR with a workaround that we can use until it does.
Most helpful comment
After a bunch of digging, I've determined that this is a bug in Gutenberg. I submitted a PR - https://github.com/WordPress/gutenberg/pull/15375
That said, I consider this to be a pretty serious issue for Sensei, and it will likely take a while for that PR to make its way into WP core. I'll put together a PR with a workaround that we can use until it does.