LibreOffice Vanilla is developed and placed in the macOS App Store by Collabora Productivity, a UK commercial services firm that develops solutions around the LibreOffice Suite. Your v5.2.2.2 is a pre-release developer build, and is not intended for production usage. That may explain why you are having issues with macOS Sierra.
It is the Document Foundation that provides the official, opensource releases of LibreOffice, and where I exclusively obtain my updates. Collabora Productivity simply provides a support link from their macOS App Store page to the Document Foundation's Community Support page. This is where you should pursue support, as it is not an Apple product.
The one occasion that I decided to try LibreOffice Vanilla, I was unimpressed with it, and replaced it with the real LibreOffice downloaded from the Document Foundation.
[Update. I see dialabrain's note about issues with macOS Sierra, but my Document Foundation sourced v5.2.1.2 appears to work just fine on macOS Sierra.]