"Important instructions" field throws error

[rezeau]

A few H5P contents have an "Important instructions" field in their Semantics file. e.g. Drag Text, Mark the Words,
Blanks, Hightlight TheWords.
In the h5p-cli development environment, in Edit mode, this feature throws the following error in the console:
http://localhost:8080/h5p-ajax/content-user-data/0/H5P-Blanks-question-important-description-open/0 [HTTP/1.1 404 Not Found 507ms]

This error does not prevent opening and closing the Important instructions field when in Edit mode. But, unfortunately, the current SHOW/HIDE mode is not saved upon exiting the Edit mode.