[Milhouse]

Assuming it's not also an issue in 4.1.5, the next step would be to work back through these test builds to try and determine when the problem first appears (which is tedious, I know, but necessary).

Edit: Actually, working back through these builds would be a good idea whether the issue is present in 4.1.5 or not, as 4.1.5 is based on Gotham not master and it could be a change added to master. Though as I can't reproduce and nobody else has mentioned it, I'd be more inclined to think it's a glitch with the caching.