Source: Apple
Apple is looking into charging issues the iPad mini 6 is running into after updating to the latest iPadOS 15.5 version. MacRumors got hold of a memo sent to authorized service providers stating it is aware of the situation. Some users report that the iPad mini isn't charging after the update.
Apple advises service providers and retail staff to inform customers to restart the device as a temporary fix while looking into the problem. The company noted that hardware replacement of the unit or its battery doesn't solve the issue, which confirms it's a software issue. Apple is beta testing iPadOS 15.6, which could potentially fix the problem.