Footage duration will not update even with clear cache and reload

I have an mp4 footage file that was originally 1 second in duration.

I created a new version that is 4 seconds in duration.

No matter what I do, the duration of the footage will not update in After Effects to reflect the new duration.

I have deleted the footage from the project, cleared all cache, closed and reopened After Effects, cleared cache again, re-imported the footage... still showing 1 second.

Yes, I have confirmed in the Finder and other applications that the file is indeed updated and 4 seconds in duration.

When I change the filename and import the footage, it is the correct length.

But as soon as I change it back to the name I would like it to be (and there's no reason I shouldn't be able to use)... AE believes that the footage is 1 second again... even though it knew that it was 4 seconds before the name change.

So there seems to be some persistent cache that I the user am not able to clear.

Any ideas?