Escaped bullet list items get converted to bullet list items

[neopostmodern]

Describe the bug
When inserting/importing a piece of markdown with an escaped bullet list item (e.g. \+) the item gets converted to a bullet list item (i.e. +)

To Reproduce
See this sandbox: https://codesandbox.io/p/devbox/mui-tiptap-demo-forked-nxv9m2?file=%2Fsrc%2FEditor.tsx%3A20%2C1-21%2C1

Expected behavior
The escape should be respected and a plain line beginning with a + should be preserved.

Screenshots
Example markdown (enabled breaks: true):

## Test

Regular hardbreaks
work!

Not a list
\+ Not an item

In editor:

Gets saved as:

## Test

Regular hardbreaks\
work!

Not a list

- Not an item

Desktop (please complete the following information):
[email protected]

Smartphone (please complete the following information):
Not tested.

Additional context
Add any other context about the problem here.

[aguingand]

You have to escape the backslash, so it should be \\+ Not an item

[neopostmodern]

Sorry, that was a very stupid mistake. I messed up things when trying to create a minimal reproduction.

I've now updated the sandbox:
without breaks: true and then Markdown

Not a list\\
\\+ Not an item

renders correctly

BUT when you hit save you get

Not a list\
+ Not an item

...which isn't valid anymore (see also the rendered snapshot at the bottom).

So the actual bug is in the save step, not the parse/render bit.

[neopostmodern]

Some more detail: this scenario works just fine in it's own paragraph...

\\+ this works though\\
so it's about the combination of a hard break and a leading escape

(also added to the sandbox)