New emoticon images show ID instead of image

I was testing adding new Emoticons (Admin > Site > Emoticons > Custom) which seems like a very straightforward process.

I added a company logo as a new image:

When I test this on a Blog post, it shows fine when editing:

However, when I save, it just shows the ID:

Has anyone experienced this or is it working properly for you? I assume it's a bug (I'm on 12.1.4.25057), but curious if anyone else has experienced this. 

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