Loading block designer blocks with image selector into composer is brokenBrowser Info Environment
When you create a block that makes use of the image selector it breaks the composer form and wont let you select an image, publish your post or even discard the draft. Please see attached screen shot to see what happens.
In my example, I've added a block that contains three fields:
2. Box Content
3. Box Image
As you can see this breaks the composer form completely.