Just another note — for context, I was renaming some custom emojis because I didn’t realise they had the same names as default emojis and they were overriding them. (E.g. :bear:) So I wanted to add a prefix for all the custom emoji names. I re-uploaded them to change the name to include the prefixes.
For the emojis whose previous names are not the same as any default emojis, all instances where people have used the emoji now just have the :emoji_name:.
It would be helpful if the feature of renaming emojis also updated the names of wherever the emoji has previously been used.