Dell Power Companion 18000mah throttling XPS 15 9550 CPU

On BIOS 01.01.19, when I plug the 18000mah Dell Power Companion in to my XPS 15 9550, the CPU locks to it's x9.0 multiplier. It's as if it's setting the CPU speed on how much power is coming in to the laptop (as the Power Companion is too weak to charge it).

This reminds me of the old issue of the CPU multiplier locking when removing the power connector, which now seems to force the CPU to drop to x9.0 multiplier before climbing back up slowly (so it's not instant, but good enough).

Does anybody else experience these issues?