Similar to #5180, the icon syllabary-katakana-halfwidth has a duplicated alias writing-system-katakana-half-width listed in the 5.2.45 meta.json file.
That's deliberate, @Xcodo; notice the extra hyphen in the alias. It's primarily for the benefit of people searching for it under that name as it was recently renamed.
I might be wrong @PeterShaggyNoble but I think the hyphenated version appears twice in the alias field in the JSON. I'll check again in an hour or so.

@Xcodo You were right about this bug.
This bug was fixed. I'll be adding scripts to our verification script to catch these types of things.
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@Xcodo You were right about this bug.