The error hint only shows up with WordPress 5.4.2.
I believe that the row block has all the functions that it should have.
But as you can see, the output of a row block is not a valid piece of html, so I think there must be something wrong with the save(output) method.
I was using 1.1.2. When I upgrade to 1.2, there is a breaking change. block-column(1.1.2) –> block-columns(1.2)
**v1.2 still has this issue.**
I have checked the js code and I guess the following line is not good.
return wp.element.createElement("div",{class:"row "+e.attributes....
class may not be a proper attribute. I think the following should work:
return wp.element.createElement("div",{className:"row "+e.attributes....
