Ultra S21 extremely slow wireless charging

I had the S20 Plus previously and fast wireless charging would work normal with my Samsung wireless charger. I recently purchased the S21 Ultra and the wireless charging is way slower on the same Samsung wireless charger. For example, my S21 Ultra last night went from 15% to 52% over a period of 8 hours, where the S20 would’ve been at 100% in half that time. Is this a known issue with the S21’s, or do I need to take my phone in for service?

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