I am afraid I am unable to replicate the behavior you are observing. Could you please provide some more details on your setup? I tried scrolling a document containing an InlineUIContainer so that the container is out of view, but this does not cause the container to disappear on our end.
If possible, please create a simple sample application and send it to us through a support ticket, so that we can investigate the cause of the issue.
We're looking forward to your reply.
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