Intermittent issue with `sensei-lms/ui` block not supported in lesson template

[donnapep]

This issue is to track info about instances where the sensei-lms/ui block is not supported in the lesson template. I've seen this issue before myself, but have been unable to reliably reproduce it. And when I did see it, refreshing the page resolved the issue. My best guess is that there's some sort of timing issue.

Steps to Reproduce

• Unknown

Additional Details

• From https://wordpress.org/support/topic/how-to-customize-the-learner-mode-template-fse-issues/ - Jetpack was cited as a possible culprit. (Note: I don't use or have Jetpack installed on my local site install, so this issue happens independently of Jetpack.)
• From 8712906-zen - Someone developing a custom theme also reported this problem. (UPDATE: I tested using her custom theme and was unable to reproduce.)

[github-actions]

Support References

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• 8712906-zen

[jinnypark]

@donnapep an update from the forum user: user says there's an error message in the template editor, though the block is actually supported and functions:

I stand corrected. Having applied the lesson template to a lesson, the navigation actually works, even if it says in the template that it is unsupported.