Found a bug in the RCP Panel in Rhino. If you publish a panel to RCP the size of the panel adjust to fit the content. If the content however changes the panel in RCP stays the same size and the text overlays over the rest of the UI elements.
The only way currently seems to be to edit the RCP elements and move the panel a bit and then it resizes. Surely, the intended behaviour should be either auto-resizing or adding scrolling to the panel if the content is longer than the space of the panel.
I’m still hoping one day we will see a proper update to the implementation of RCP. Right now it’s okay for a few small things, but lightyears from the potential it could use.