There is an issue with the layout editor in 1.21.0, its just loading a blank page

There is an issue with the layout editor in 1.21.0, its just loading a blank page

when using console it is showing this error: Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.

@NZHYDROGEN do you have anything different about your Node-RED setup? Proxy? How is it hosted?

@NZHYDROGEN what browser and version are you using? Can you try a different browser?
Try restarting node-red and clear the browser cache (via the browser menus not hot key).

for example this works:

but if i have a page like this it wont load the editor:

I have tried clearing the browser, rebooting, other browsers and the fault can be replicated every time.

my feeling is there is a conflict with the editor when the page has a Ui-Table?

@NZHYDROGEN,
I had exactly the same error recently in my custom ui-web-push node. But can't remember it exactly, because I had multiple related problems at that moment.

Could you please open the Developer Tools of your browser, and have a look in the Network tabsheet for any errors. Might be that you then need to reload your page.

Yea, I have tried that i can replicate the issue on any page where there is a Ui-Table present

its gets this error in console with any page using a Ui-Table: Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.

And do you see any errors in the Network tabsheet?

just this one:

Thanks! That makes no sense to me. I had expected to see an error here. But not sure. Seems you have no filter applied and show "All" requests. So that is good.

You might keep this tabsheet open and refresh your dashboard browser page, to see whether errors popup.

I am off to sleep. See you tomorrow...