I have defined a single-select field (which I then use as a column choice for a board).
I can make changes to the underlying type (by opening one of the single select column options and editing its type).
I added some extra fields to the single select type and then I updated the entity name so that it was based on a formula that uses the fields of the type (instead of being manually typed).
Subsequently, I discovered that I couldn’t change the name of the single select field itself.
I realise that this is not a bug that many people will encounter, but I thought I’d report it anyway