i tested it on my testboard with a post related warning and a non post related warning no errors at all (both of them didn't showed up) the postdata_start hook at wrong code PHP code in it true but you need to manually edit the plugin at that hook and no you need that hook or some data will be missing.I'll see later to package the fix as a plugin that you can import.This is not your fault but mine i forgot to mention you need to manually update that hook otherwise vBulletin will not update it
here it is imprt this through admincp => product system => download/ upload plugins
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