[tag:bug]

As noticed by user [musefan](https://meta.stackexchange.com/users/170531/musefan) in [this post](https://meta.stackexchange.com/questions/349492/strikethrough-markdown-not-rendering-on-post-but-works-on-preview):

 Using two tilde signs no longer renders as strike-through text, but does render like that in post preview.

~~Click edit to see this text in strikethrough in the edit preview~~