Exercises are being marked as 'Incomplete' for no obvious reason

[pcenov]

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Observed behavior

The issue can be replicated at both hotfixes and production: when I open an old channel with exercises some of them are being marked as Incomplete. If I just open the Edit details modal for the exercise and close it then the Incomplete status is removed:

incomplete.mp4

The same is valid for some exercises with Completion set to When goal is met so it's not just valid for exercises with Completion set to Practice as I initially thought:

goal.mp4

I'm not seeing any relevant errors in the browser's console. I'm also not able to replicate the issue when creating new exercises of all supported types.

Test channel with such exercises at production: ragon-migot
https://studio.learningequality.org/en/channels/bb0325fbb094495dbe6a5bebf082f97a/#/cec1625e53e24a889ea8c4fa9b9dbe08

Expected behavior

Exercises with no missing required fields, metadata or questions/answers should not be flagged as incomplete.

Steps to reproduce the issue

1. Sign in to Studio
2. Go to a channel containing previously created exercises and search for ones marked as Incomplete.

Usage Details

• OS: Windows 11
• Browser: Chrome, Firefox

[pcenov]

@radinamatic

[rtibbles]

This has been fixed in #5714 and #5731