Errors when using in block editor

[rdunk]

I get this error after creating a table inside a block editor, closing it and then trying to add another row/column after opening it again.
Error: Cannot add property 2, object is not extensible

However, the plugin works as expected when it is not used with block content. I basically can't edit the table in block content after it is created.

Update:
If I remove a row I can add rows again, but the issue comes back when I try to edit it after.

Originally posted by @ThomasSchuller in #8 (comment)