The action of changing the orientation of the screen from landscape to portrait and vice versa disappears the written text

Expected behavior

When I used the app and was writing some notes. I rotated the screen from portrait to landscape, it was expected that the text written remains there no matter the change in orientation or not.

Actual behavior

When we write something in portrait mode for example, and then rotate the screen to landscape mode, the text that was written disappears and all the work is lost. Same thing happens when you're writing in landscape mode and then rotate the screen to portrait mode.

How to reproduce

1. Open the app.
2. Click on the Plus icon present on the bottom right of the screen.
3. Now write something in there.
4. After writing some text, rotate the screen.
5. It's observed that the text you'd written disappears.

• App: Markor v0.3.6
• Operating system: Android Nought (7.0)
  Moto g5 plus

Recording Of The Bug