While trying to assist with the formatting of a question which spoilers a list, I discovered there's not a lot of parity between how spoilers and quote blocks (which are superficially quite similar) handle nested Markdown formatting. (Simple HTML works fine.)
For example, here's a variety of typical Markdown nested inside a quote block:
even nested quotes!
- with nested nested formatting!
Aside from the code and quote blocks not standing out due to matching background colors, everything works exactly as expected. Sadly, the same is very much not true for spoilers:
### heading --- paragraph code block - nested 1. list > even nested quotes! > > - with nested nested formatting!
Eek! Any chance of changing spoilers to act more like quotes? Needing complex formatting in spoilers isn't a terribly common scenario, but when you do, the inconsistency is jarring and a bit frustrating.