Available in the R1 2018 release. 

After items have been inserted at runtime in a DataGrid that uses grouping, visual glitches occur and upon tapping an exception is being thrown. The visual glitches may include an item overlapping a group header; missing items; duplicated items. Upon tapping an incorrectly drawn group header, an exception is thrown. 

Available in minor release 2017.3.1214. It will also be available in the R1 2018 release.

 If you open a datagrid's filter pop-up, navigate away from the page, then go back to the page, the filter pop-up will still be open.

If you attempt to close it, by way of the "X", the app will crash. In debug mode, a null reference error will occur. If navigating away from the grid with the filter closed, no crash will happen.

filtering can no longer be applied as the "Reset" and "Filter" buttons are disappeared.

workaround use Xamarin.Forms v 4.8.0.1269

Available in the R2 2018 release.