"Unable to parse your markup" when switch between modes

[vladKrk]

How to reproduce

1. Open editor in markdown format
2. Add this to your markup [ ] page={number} ( checkbox with content that has brackets )
3. Try to switch mode to "Visual Editor" or click button Preview

Expected result

Mode switched, markup is correct

Current Result

Additional info

I reproduced it in mardown-editor playground, the error comes from markdown-it-attrs.
If paste content in markdown mode without checkbox, like this page={number} this will transform in visual editor like this page=

[d3m1d0v]

Problem in transformer, same issue in diplodoc: diplodoc-platform/transform#559