How could it be a Webkit bug? Seems to me it's something funny related to PHP doing unloading when it shouldn't.
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I don't know... How could it NOT be a WebKit bug when it can only be reproduced on WebKit browsers...? I didn't say this arbitrarily. It just happens that I tested dozens of times on all browsers.
I didn't test, however, forcing a fake WebKit user agent on a non-WebKit browser, and the other way around...