pictslider is not visible to MIDI mapping, even though the 'Visible to Mapping' is checked. In mapping mode it cannot be enabled.

If one checks 'Parameter Mode Enable', then 'Visible to Mapping' becomes greyed out, though still checked. Unchecking 'Parameter Mode Enable' does not bring 'Visible to Mapping' back – it remains greyed out, but checked.

Is this a bug, or expected behaviour? (If it's expected, what is it doing?!)