I received the news that Apple intends to add certification to wireless fast charging in iOS 13. If it does not meet Apple’s requirements, the wireless charger will be locked at 5W, and the QC3.0 charger will measure only 7W. Under normal circumstances, if the fast wireless charger reaches 7.5W, the power of the QC3.0 charger should reach 10W or more. Now the model of the device in my hand is A2521. I think this device can’t be fast wireless charging for iPhone. Because use the iPhone to fast charged before upgrading iOS 13, the QC3.0 charger can measure more than 10W of power, and now upgraded to iOS 13, it is locked at 7W.
Please note! The PowerWave 7.5 Stand (model: A2521) does not seem to be able to fast charge the iPhone for iOS 13.1
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iPhones were limited to 7w for fast charging, anything above such as 10w is for Android phones. And the only way to enable fast charge is by using a Quickcharge 2/3.0 wall plug. Anything else will slow charge the phones
I am not well expressed. The power at the end of the charging head is not equal to the power of the wireless charger, but the power at the end of the charging head cannot reach 10W or more. It can be determined that the wireless charger does not reach 7.5W. Now this device is really not up to the required 7.5W and is locked at 5W of wireless charging power.
In addition, I definitely use the QC3.0 charger to test it.
I would also like to add that the PowerWave 7.5 Pad models A2514 and A2501 have no problem and can output 7.5W (the power measured at the end of the charging head exceeds 10W).
Oh no 
I have the B2514 PowerWave model and I also have the impression my iPhone 8 charges now slower after the upgrade to iOS 13. Too bad.
None of this has to do with Anker, Apple is the one to blame for all the issues from charging to bluetooth problems as everything worked before their update and new phones came out.