I defined a shortcode [plot] to write dot code. For example, I insert code below by using Gutenberg Shortcode:

[plot]
digraph G {
a->b;
}
[/plot]

But when I re-edit the code, it will be converted to:

[plot]
digraph G {
a->b
}
[/plot]

> will be converted to >, it is difficult to copy dot code for debug.So, how to prevent the convert?