Escape character not working for code blocks in markdown

[TreapGoGo]

At the beginning, I tried to write

snippet cpp "C++ code block" i
```cpp
$1
```
endsnippet

However, this whole extension broke down. I think it is the backquotes' fault.

Then I tried to write

snippet cpp "C++ code block" i
\`\`\`cpp
$1
\`\`\`
endsnippet

And here is the consequence after I press Tab:

It seems that backslash cannot play a role as escape character.

[Take-Me1010]

I have same issue.
After some trials, I found this below snippet works.

snippet cpp "C++ code block"
``rv = "\`\`\`cpp";``
$0
``rv = "\`\`\`";``
endsnippet

Obviously, this solution is not beautiful.