How to reproduce:

Use the attached file (Screen01.ui.qml) with the qmlpreview tool.

1) Using just the qml tool works as expected: qml C:\example_test\BloomTest\content\Screen01.ui.qml

2) When using qmlpreview I get a crash on the first update of the file: qmlpreview qml C:\example_test\BloomTest\content\Screen01.ui.qml (crashes if you apply/save the first update)

If I remove the DRBloomTonemap effect qmlpreview works as expected. The effect does not have to be applied to the environment.
Simply instantiating the object is enough for the crash.

This was discovered in the Material Bundle Example in Qt Design Studio (QDS-9294).