[name=..] doesn't work if quote contains code block

### Is this a hackmd.io issue?

- [x] Yes, the bug happens on https://hackmd.io
- [ ] No. If it's a self-hosted CodiMD instance, please fire up the issue in the repo of CodiMD: https://github.com/hackmdio/codimd

### What's the problem

```
> foo
> ```js
> let a = 5;
> ```
> [name=adsf]

> foo
> [name=adsf]
```

#### Current behaviour


#### Expected behaviour

I would expect `[name=..]` to render the same in both cases.

#### Environment

I use HackMD on:

**Desktop**
- OS: Linux
- Browser: Firefox
- Browser Version: 80.0b4