If you require the field to be changed only on the transition then you should add the field to a screen that is only used for the transition. It should not be included on any other screen especially the edit screen as that will allow inline editing.
You then need to set a validator on the transition to ensure that the field is completed as part of the transition.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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