[BUG] Grid options as injected by Layout Editor turns Visual Editor invisible

[Wookbert]

VisualEditorBug.mp4

As soon as one touches (or changes) the grid under the Layout tab, saves the card and re-opens it, the Visual Editor is gone and empty.

As one can see in the above video the misbehaviour is caused by the grid layout code injection, e.g.

grid_options:
  columns: 12
  rows: auto

As soon as this code is removed (via Code Editor), this Visual Editor reappears immediately.