BUG: By typing the text disappears (XMind 2020)

Hi,

If I start a new document, add a topic, but when I'm typing my text disappears. Then I close the document and reopen it and the text appear. When I'm edit or add a (sub)topic, then the texts will disappear again. It's really frustrating, see my video: https://we.tl/t-1EdZ83RyMq or the screenshot below.