Hi Nico, thanks for reporting it. Some of the issues are definitely bugs, but others are likely not:
‘Edit viewer settings’ icon on the left edits the settings of the inner viewer, as opposed to editing the global trellis settings. In the future, we will combine both settings under the standard gear icon.
This has just been fixed (the fresh dev build will be available in 30 minutes). Apparently we broke it for scatter plot when we introduced the “filter by zoom” feature; all other viewers were working fine.