QUrl::toPercentEncoding encodes '%' although it's contained in the exclude list

After switching from Qt 6.2.4 to Qt 6.4.2 the behavior of QUrl::toPercentEncoding has changed:

The code

auto encoded = QUrl::toPercentEncoding( QString( "space=%20&comma=%2C" ), "%&=" );

gives different results.

• Qt 6.2.4: "space=%20&comma=%2C"
• Qt 6.4.2: "space=%2520&comma=%252C"

I could not find any bug fix by searching for toPercentEncoding to explain this behavior change.

Best regards,
Max