I am noticing this issue in XF 5.0.
You can get a demo app for this issue at https://www.dropbox.com/s/rv4quorssslak1g/ios_issue1.zip?dl=0
Run it in both Android and iOS. Tap on the "Display Log Lines" button. Several lines of an import operation log will be displayed as expected.
Then comment the lines that set ImportLogCaption.Text at the beginning and end of the event DisplayLogLines_Clicked in MainPage.xaml.cs. In iOS the log lines will not be displayed as before. No issue running in Android.
Is this a bug in XF 5.0?
ThanQ...