Assert when opening GradientPresetList

When building against Qt6.2, there is an assert when opening GradientPresetList. If you ignore the assert, everything seems to work fine:

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Microsoft Visual C++ Runtime Library
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Debug Error!

Program: C:\dev\qt\qt62-build\qtbase\bin\Qt6Cored.dll
Module: 6.2.0
File: C:\dev\qt\qt6\qtbase\src\gui\util\qgridlayoutengine.cpp
Line: 246

ASSERT: "sumFactors > 0.0" in file C:\dev\qt\qt6\qtbase\src\gui\util\qgridlayoutengine.cpp, line 246

(Press Retry to debug the application)

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Abort Retry Ignore
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If you comment out all anchoring from GridView in GradientPresetTabContent.qml, the assert goes away, but nothing will be shown. Any width/height dependency to the parent seems to trigger this.