Migration Mendix 8 to 9 / Richt Text Widget disappears

Hello,   I have upgraded a Mendix app from Version 8 to 9 and also made the Atlas 2 to 3 upgrade. When I try to upgrade the Rich Text widget to the newest version from the marketplace and update the definitions, it disappears in the running app. Only if i downgrade the Richt Text to v.2.0.0 it appears again in the running app. Is there maybe some conflicting in different versions of the widget that can be solved somehow ? Thanks!
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