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The xaml previewer is being enabled for WPF xaml files, for example this file:
d:DesignHeight="300" d:DesignWidth="300" Name="methodListPanel">
*** Bug 42233 has been marked as a duplicate of this bug. ***
Fixed in version 18.104.22.16896 (master)
Author: Alan McGovern
Commit: 7cd650560d8e98b45be702cff07168bd3520604a (xamarin/md-addins)
Included in Commit: 964f8b4344468429a2b50a4476e163d2c6b1ac72 (mono/monodevelop)
I'm not 100% sure what you're doing in that screencast.
The fix we made was that if you double click on a xaml file in the property panel, or open it in any other way, we check it is a xamarin.forms xaml file before enabling the previewer.
If the file is xamarin.forms xaml originally and then you modify it to make it invalid, then it will simply be invalid xaml and will display the error you saw.