Bug: Field settings not working after first save

[robzor]

Hi there,

Craft: 3.6.16
Colorit: 1.0.9.3

Steps to reproduce:

1. Create a colourit field and choose a Preset.
2. Save the field
3. Re-open the field for editing
4. Change the Preset dropdown to 'No Preset'

You now cannot edit the Colorit field settings at all. This is what it looks like: