Mikey Campbell:

As seen in the image above, Apple is no longer allowing developers to submit app description edits with the unique character sets, which in this case includes a checkmark, explosion, “no symbol” and a speech bubble. It is thought that others are included in the new restrictions, but that has yet to be verified.

It appears that Apple has also started restricting usage of glyphs that aren’t necessarily emoji.

I would welcome a change to text-only release notes. While emoji and other characters can add a bit of fun and personality to otherwise boring release notes, some developers were overusing them.