'imageprovider' example does not run

Steps to reproduce:

1. Install 5.15.0-alpha snapshot from staging
2. open Qt Creator and open 'imageprovider' example
3. run 'qmake', 'build' and run the example

Expected result:

imageprovider runs without problems.

Actual result:

When launching the example text:"'imageprovider.moc' file not found. You need to set an executable in the custom run configuration." is shown.

If running the .qmlproject with qmlscene, you get: "['file:///C:/Users/qt/RTA/qt5/Examples/Qt-5.15.0/quick/imageprovider/imageprovider-example.qml:51 module "C:.Users.qt.RTA.qt5.Examples.Qt-5.15.quick.imageprovider.ImageProviderCore" plugin "qmlimageproviderplugin" not found\r', '\r', '']"