The expect charge speed is specified like this.
"The data comes from the OnePlus test laboratory. Test date: March 6, 2021. Test Environment Standards: Environmental ambient temperature: 25°C ± 1°C. Operating temperature of the phone when charging starts: 25°C ± 1°C. Test process: Charging commences from 1% with official OnePlus Wireless Warp Charger. The screen stays off during the entire charging process. On average, 30 minutes of wireless charging of OnePlus 9 Pro with official OnePlus Wireless Warp Charger from 1% will charge to roughly 70% of battery which can be used for 5.5 hours under OnePlus DoU (Day of Use) model. Actual performance experienced by users may vary based on the specific charging environment conditions."
It does not say... But I assume that it is without a case. The thicker the case the less speed (and beyond a certain thickness not at all).
The added heat that the device may generate itself until the software has settled in a bit and runs optimally may also affect the charge result
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