pandoc's markdown output damages documents in certain case

[bwl21]

I have a document like this:

This is a test this is a test this is a test this is ta test this is a test this is a test iths is a test

- **this is a list - list - list - list - list - listelistelisteliste - list**

I process this using

pandoc x.md -o x.md

This is the result

This is a test this is a test this is a test this is ta test this is a
test this is a test iths is a test

-   **this is a list - list - list - list - list - listelistelisteliste
    - list**

If I "beautify" this again

This is a test this is a test this is a test this is ta test this is a
test this is a test iths is a test

-   \*\*this is a list - list - list - list - list -
    listelistelisteliste
    -   

We can see that markdown output produces unintended lists. As consequence, I cannot use the markdown output to beautify a markdown document.

Would it be possible that pandoc avoids a line break before a "-". There might even be other circumstances where something like this happens.