When I edit an answer (mine or somebody else's) with the new Stacks Editor, the answer's Markdown does not appear in the editor. It remains blank:
Questions don't have this problem (those use the old editor) and it does not matter which mode (Markdown / Rich Text / Markdown + Preview) I'm in. It happens in various browsers, so it's not caused by one of my userscripts.
I'm pretty sure this is a recent bug, as it used to work fine this morning.