Oh wow, that is fantastic. I know the solution then. Looks like this bug extends to text inputs, or other inputs appearing as text inputs.
With this custom CSS you can get rid off the problem:
div.asp_w.asp_m .proinput input[type=search].orig {
-webkit-appearance: searchfield !important;
}Clearing all caches after adding this should resolve the problem immediately. I will of course incorporate this solution to the upcoming release. Hopefully apple will fix the actual bug by then as well.