Is it right that you have to recast presets after copying even if extra data isn't added? I've got a sequence that references a colour preset and if you call that preset, make a change and update it works as expected (the sequence is changed). However, if you copy a different preset into the referenced slot then the sequence isn't updated.
When the sequence is on the fixture sheet shows that it is referencing the preset (ie. it says 4.101 in the RGB column).