it is not possible to remove a block from eZ Flow block if try to do it with the trashcan icon, and there's no other way to remove the blocks.

You will get the following error in Firefox, but the bug will happen in any browser:

TypeError: Argument 1 of Node.removeChild is not an object.
...&&(t=t._node),n&&n._node&&(n=n._node),u=o[e](t,n,r,i,s),c.scrubVal(u,this)},swap...
node-core-min.js (line 8, col 5181)

NOTE: This bug actually makes impossible to remove a block from the layout attribute

Steps to Reproduce

1. Create or edit a Landing Page content object
2. In the layout attribute, add "Main Story" block
3. Click on the "trashcan" and try to delete the block