Fix this bug: .JS files served as application/x-js, so they break in Chrome

A maddening bug: .JS files uploaded to Design Studio are sporadically served with the MIME type x-js. There's a clue to this when they're uploaded:

Scripts are unusable in Chrome when this occurs (thus meaning scripts can't be hosted reliably on Marketo):

It's notable that it happens directly after a file is uploaded or replaced:

but after a soft reload, it will be served correctly:

and even subsequent hard reloads are valid:

This suggests the problem is cache-related. But one can't be sure from this end.

Hard-coding the MIME type on the <script> element does not fix the problem.

Scripts should always be served as application/javascript.

Level 10

Tacking on a very similar issue here: locally stored JSON files are served as application/octet-stream rather than application/json.

Level 10

A quick note that JSON files now are correctly serving as application/json as of this morning.

Level 10

Reverted back to application/octet-stream as of of January 11.

Level 3

My javascript files upload as text/plain and also do not work. How is this not fixed?

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