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Greetings from Syncfusion.
We have checked the reported scenario and the issue is not reproduced in iOS platform when setting Visual property as Material in the SfExpander. Could you please ensure once whether you have initialized the SfEffectsViewRenderer in the AppDelegate.cs file? We have attached the tested sample.
Please check the below sample and confirm us whether you can able to reproduce the issue in your side. If you still facing the issue, please revert us by modifying the attached sample to reproduce the issue which will be helpful for us to assist you earlier.
We were able to reproduce the reported issue. We have confirmed this as an issue and logged bug report. We will include the fix in our upcoming weekly NuGet which is available on 12th November 2019. You can track the bug status from the below link.
If you have any more specification/precise replication procedure or a scenario to be tested, you can add it as a comment in the portal link above. We appreciate your patience until then.