Extension Console mods and Page Editor mods activated keep getting out of sync

[grahamlangford]

Describe the bug

https://pixiebrix.slack.com/archives/C0436P48QHY/p1712256983102099

To Reproduce

Steps to reproduce the behavior:

1. Install the MV3 version of the Extension
2. Activate a mod in the Extension Console
3. Attempt to edit the mod in the Page Editor

Actual behavior

The mod is not visible in the Page Editor

Expected behavior

The mod is visible in the Page Editor

Screenshots/Loom

Desktop (please complete the following information):

• Extension Version: 1.8.12-alpha.2
• Manifest Version: MV2 and MV3