we updated recently to Juce 6.1.2 and in general it works well with plugins that resize, however we have noticed this problem with Ozone V9 VST3.
The plugin resizes ok, then when we close and reopen the hosted plugin’s window, it appears cropped and magnified. The only way to get it back to normal size is to remove the hosted plugin from the host.
Here is a video that shows this behavior:
In the previous Juce version it would create a black area on the 2 sides of the plugin window during resizing, but when closing and opening the window, it would return to the normal size.