The preview goes blank; sometimes in preview window, sometimes in design tab also, and sometimes the preview comes but the views go unclickable.
I tried refreshing the layout from design tab, Select design surface; but it only helps sometimes. The preview goes blank as can be seen in the screenshot.
For other information, I am using constraint layout 1.1.0-beta6
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I cannot find any specific scenarios when this occurs nor any steps to reproduce the issue.