Callouts are detached from their content

[annappropriate]

It seems that callout headers are getting detached from the callout contents. Please consider this example:

# Example
## Simple callout
>[!quote] 
>Hello, world!

## Untitled callout with list
>[!note] 
> - item 1
> - item 2


## Titled callout with list
>[!important] Super important stuff
> - item 1
> - item 2

In the first case, the callout header just hangs in midair by itself, not carrying any information. As for the second case, I feel that the callout content should be rendered similar to how lists are rendered, branching from their parent header.

I do make use of callouts to make my notes :sparkles: readable :sparkles:, so I would really appreciate if you could look into this issue.