What were you doing:
Putting spaces before pdf preview
What feature did you use:
Embedded pdf preview turned into codeblock.
Removing spaces does not bring back preview.
What did you expect to happen:
Either not allowing to further space indent or not turn into pdf embedding command.
Also after removing 4 spaces the previews should reappear.
I think the current behavior is correct in the sense that it is exactly what one would expect from the MD spec.
It might however catch some users off guard who expect the preview to remain visible. I do not have a suggestion on how to handle this, but knowing this sideffects might be useful.
What is however a bug is that removing a space does not turn the preview back on, this is unexpected.
Btw, love the new PDF preview have run it through all edge cases i could think of and only this came up.