WYSIWYG editing on phone does behave erratically with SwiftKey keyboard app

Possibly related to XWIKI-15554

When editing XWiki pages on a mobile chrome on Android using the WYSIWYG mode with the popular SwiftKey keyboard app (from Microsoft, for Android and iOS, > 100 million downloads on Android alone), the editing using swiping behaves erratically: e.g., words are often but not always inserted twice, and dots and commas are often ignored.

On the same browser on the same device, using another keyboard, e.g., Samsung's built-in keyboard with swiping works fine.

Also, the pure text editing using SwiftKey on an XWiki page works fine. 

SwiftKey has never shown a similar problem in any other app or webpage, despite using it for several years.