I tried to upload a larger patch of emoji into my instance. At first, everything worked fine. Then, I increased the number of files I can upload to 20, and started dropping emoji onto the customize page. I had a few errors here and there, but after an upload of around 120 images, no further upload was possible. Plus, the emoji picker did only show 3.
Deleting all emoji made things worse: now I cannot upload a single emoji, symptoms like this:
Can this be a regression of this? Or another problem? I even tried rebuilding the whole container to no avail.