Slate editor (markdown editor) refreshes automatically and looses all its content

Then it shows following error:

Which reason is described here:

ianstormtaylor/slate#4081

Also it describes a workaround (I provided it below)

To Reproduce

Just use the markdown editor for more that 10-15 minutes.

Expected behavior

The editor does not refresh itself

Applicable Versions:

• Decap CMS version: [3.0.12]
• Git provider: [GitHub]
• OS: [any]
• Browser version [any]

Additional context

You have useMemo call at line 98 here:

https://github.com/decaporg/decap-cms/blob/master/packages/decap-cms-widget-markdown/src/MarkdownControl/VisualEditor.js

It should be replaced with useRef or at least useState as stated there:

ianstormtaylor/slate#4081 (comment)