[tag:bug] 

I received a strange "Commonmark migration" edit here:
https://meta.stackexchange.com/posts/344867/revisions

[![diff][1]][1]

Both quote whitespace formats appear to be valid CommonMark syntax, so I don't know why it was migrated in the first place.

The post-migration format is clearly worse as the quote marks no longer line up in plaintext.

  [1]: https://i.sstatic.net/a1up0.png