Error: Invalid write to global property "sticky" in ScrollViewStyle.qml

On RHEL-8 with standard Intel hardware, this error popped up when we switched from Qt-5.7 to Qt-5.15.2 (and RHEL-7 to RHEL-8), with no change to surrounding code.  It seems to be benign, but nonetheless, it does say "Error" and we cannot have errors in our code.  The error is coming from the installed QML code in ScrollViewStyle.qml file, lines 127 and 166 (see screenshot).  The error seems erroneous because it is complaining about writing to a global property, "sticky".  And in the code, you can plainly see that there is a local property called "sticky".