[Reg 6.5.2 -> 6.5.3] Invocation of a Q_INVOKABLE method from QML causes the app to crash

After switching from version 6.5.2 to 6.5.3, I stumbled upon a certain bug.

Upon an event that invokes a call to Q_INVOKABLE method on an object that has been registered as QML singleton object, a crash occurs, with the backtrace attached in the report. The bug that occurred here sounds really similar to QTBUG-117805 Invocation of a C++ static method via an inherited QML singleton causes a crash - Qt Bug Tracker
though I wasn't able to confirm this myself.

Could you please confirm if the mentioned bug is the same as the one that I'm reporting?
It would also be beneficial if you could add a commercial customer priority tag to this bug.