Integration bug: vim-prettier removes text

[artkpv]

Thank you for the tool and your work!

When I run this tool, https://github.com/prettier/vim-prettier, :Prettier on a file like:

# My title

Lorem ipsum

*****

Text after line. 

Some links like [link](link.com).

It removes all the text after the horizontal line, "*****".

Expected: no removal of text, and the formatting is made by the prettier tool.

Note. When I run just prettier from CLI it preserves the text. When I uninstall vim-markdown plugin and run :Prettier it preserves the text.

Version: 8f6cb3a

Notes. I think it has something to do with that Prettier inserts there '-----' which are treated as headers by my folding,i.e. I see folding functionality though accordingly to CommonMark standard those should not be headers.