When clicking on a folder, it will cause the text label to wrap and appear on a line under the icon. With short folder names, this then makes it difficult to click the folder - or others - without doing a full page refresh (F5) to get the folder tree to redraw itself.
We have released a hotfix which is attached to this KB article. It is also available from the customer area of our website.
Cloud customers will have the hotfix applied on September 4th, 2019 as long as they are part of our main auto-update channel.