Virtual Console - lost solo frame

[Jelu]

Hello,
I tried to create a solo frame with different buttons. I saved the project and I added (second time) more buttons into the same solo frame.
After that, I switched from page 1 to page 2 and back to page 1.
Now the solo frame and all buttons are lost/deleted.

What I did..
- I created a solo frame on page 3
- I added some buttons
- saved the project (!!!)
- after that, I clciked the button "enable/disable the widgets edit mode" and I changed the size of the solo frame.
Now I tried to move the solo frame to an other position. At this moment , the solo frame jumped to the left corner on the top.
After this I tried to add more buttons into this solo frame but it was not possible.

After that, I switched from page 3 to page 4 and back to page 3. Now the solo frame and all buttons are lost/deleted.
I made a video about this but its not possible to attach it.

Windows 10 - 1903