Spoiler with text on the same line as the tag no longer works

[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.