It’s a normal array then a set array, doesn’t work.
Is this a custom inspector/property drawer set up? You’re going to need to give us examples of your code here to be able to help.
Plenty of traffic over in the Editor and General group about this bug. Not sure if it got fixed yet.
It’s just a scriptable object with an array of scripts marked with [Syetem.Serializable] and in that script another script marked the same.
if you still need code that’s fine I can provide