Qt 6.11 is out! See what's new in the release
blog
just sharing - FYI ?
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I loaded 6.2 and now getting this error.
It is coming from btscanner and I suspect I used wrong kit to build it.
However, it appears to be one of those warnings , but it won't build so it is not a warning.I will take a look at the source code.

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See https://codereview.qt-project.org/c/qt/qtconnectivity/+/300221
Basically the property was removed in Qt6 as it did nothing anywayP.S.
6.2 is still i beta, the official release is scheduled for September 2021.