When selecting an innerBlock container, like a single column from the column block, we have the option to "edit as HTML". If you click out of the inner block while editing as HTML it will produce an "unexpected or invalid content" error.

Is the edit as HTML option useful for inner block containers? It seems like it breaks the code.

I'm using Gutenberg version 4.1.1. and Chrome 70.0.3.

Screenshots testing on Columns block: