They know about this. It's how they track you across the sites, it's using cross-site tracking, which is a technique ad providers also use. As such, it's blocked by default.
You can turn off "Prevent Cross-Site Tracking" in Safari settings under Privacy, or use a different browser. I wouldn't hold your breath on Pioneer fixing this and using a more up-to-date (and less intrusive) way to manage single sign-on.
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