Our LIB (latest internal build) is released every Monday and it contains the latest bug fixes for the suite. You can get the LIB from the UI for WPF download page in your telerik.com account, by clicking on the Latest Internal Build button, or selecting the Internal Builds tab, and then selecting the version you need. See the attached picture.
However, please keep in mind that the LIB versions are not stable and we don't recommend using it in production. In order to get the fix and be sure that everything is tested and works properly please use the R1 2019 version.
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