Hi Richard,
Sorry for the inconvenience caused.
We have confirmed that the issue with “SfListView item get disappear while switching the tabs in TabbedPage” is a defect and we have logged a defect report. The fix for this issue will be available in our upcoming 2017 Vol 1 release which is scheduled to be rolled out by February 2017.
Please let us know if you need any further assistance.
Regards,
Dinesh Babu Yadav