[spoiler] is an inline / block level element
[quote] is block only
What I eliminated was “mixed” mode.
What about this text:
I **think this should be bold
but it is not**
Which render as expected when you remove the newline?
I **think this should be bold
but it is not**
Supporting mid-sentence multiline [spoiler] is at odds with CommonMark philosophy. No other CommonMark syntax operates like that.