I was experiencing these during the beta1-3 as well. It’s about the JavaEmbeddedFrame being visible on the taskbar. And the second bug is the trey icon being 1/4 it’s size and the remaining 3/4 being black. The third bug i cannot show somehow due to screenshot not working during the menu pop up. But the menu you get when right clicking on the trey icon is too small, probably due to me using Hi-DPI setting.
OS: Linux Mint 19.3 x64
Using the .appimage version.