double escaping in code tags happening

if I write something like:

```
`Uint<LIMBS>`
```

It will eventually render as:

```
<code>Uint&lt;LIMBS&gt;</code>
```

but with this extension it renders as:

```
<code>Uint&amp;lt;LIMBS&amp;gt;</code>
```

which displays as <code>Uint&amp;lt;LIMBS&amp;gt;</code> instead of <code>Uint&lt;LIMBS&gt;</code>
