Hi Brunno,
We’ve been able to look into this issue and reproduce it locally. We believe we understand what is going on and have potentially fixed the issue. From what we’ve seen, this issue seems to only occur if you copy/paste or cut/paste viewports with modified styles.
If you instead perform a move copy operation (should be ctrl + move on windows and option + move on mac), then you won’t see this issue.
Let me know if this helps,
Adam