I really wanted to like penpot, but when I tried a few months ago, simply navigating between pages (even on the example documents) was causing parts of the document to change in bizarre ways. I didn't want that level of risk with documents I actually cared about, so continued to use figma. I guess it's time to give it another shot.
EDIT: still broken 8 months later :(
I've loaded an example document and do not see what you mean when navigating between pages. A problem like that should be extremely jarring and it is very hard to believe it would be ignored.
I think you should post a issue at this point D: