as per the question here: https://answers.unrealengine.com/questions/30364/tarray-not-editable-in-blueprint.html
It seems that Tarray of Int8 and maybe other type are not editable in the editor.
Thanks to fix this as it is a basic usage for Archetypes.
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Add a Tarray and mark it as editanywhere.
Open a BP of this class, and you will see that you can’t edit the property value.
I tested it in 4.4.3
I hope you wil fix this.
Int8 is not supported by blueprint and it seems it won’t be
but you could use uint8 (byte value) which is supported, or else you really need minus numbers
As Shadowriver mentioned,
int8 variables are not usable in Blueprints. The only numerical data types that can be used with Blueprints are
float. Other numerical data types are usable in C++, but will not work with Blueprints.
Unfortunately this is a design limitation of Blueprints, and not a bug.