plantuml inside admonitions rendered outside

Hey,

I've a problem using plantuml-renders inside of admonitions from python-markdown. I asked in the python-markdown repo yet, but as it's only happening with the plantuml renders, they suspect it's up to this extension.

setup:

package	version
python	`3.8.5`
markdown	`3.3.3`
plantuml-markdown	`3.4.1`
pymdown-extensions	`8.0.1`
mkdocs	`1.1.2`
mkdocs-material	`6.1.6`

problem:

If I write plantuml code, inside a code block, inside an admonition, the picture from plantuml-markdown get's placed below the admonition in the generated html.

Normal code blocks are working fine, but the as plantuml marked ones replaced by the render not.

example code:

!!! note
    ```plantuml
    A --> B


html output:  
```html
<div class="admonition note">
    <p class="admonition-title">Note</p>
</div>
<p><img src="data:image/svg+xml;base64,<data left out>" class="uml" alt="uml diagram" title=""></p>

desired behaviour:

The produced diagram should be inside the admonition.

html output:

<div class="admonition note">
    <p class="admonition-title">Note</p>
    <p><img src="data:image/svg+xml;base64,<data left out>" class="uml" alt="uml diagram" title=""></p>
</div>

mikitex70 / plantuml-markdown

plantuml inside admonitions rendered outside #51