stateDescription metadata page is broken in OH 5.0 demo app

[lolodomo]

The problem

When running Main UI from OH 5 dev environment (Eclipse), the page presented when adding a state description for an item is empty (config tab):

Code tab is OK.

Steps to reproduce

In Main UI, add a new item, just enter "test" as name and click on "Create" button.
Go to the page of the new item, click on "Add Metadata" and then on "State Description".

Browser console

No warning/error.

Browser network traffic

Additional information

Same in Firefox and Chrome.

From this list of predefined metadata, this is the only one displaying a blank page:

Doing exactly the same thing with my OH 4.3 production server is working as expected.

@florian-h05 : can you please try to reproduce ?

[florian-h05]

I can reproduce this issue, it is due to #2752 but this issue is not the UI's fault.
When checking the API explorer, I can see that the demo app is completely missing the /rest/transformations endpoint! (You can see this in the browser console and network tab.)

I have created a fix for that: openhab/openhab-distro#1714