Default array value keeps clearing

I have an array of UMG widgets, and its default variable values keep resetting, so I have to set the default variable every time I open the project.

This is before I set the value again (I’ve set it before)

I then change it to the widget reference on index 0

Just in case I changed the widgets color to make sure the project was actually saving

Then I hit ctrl s to save the widget, file save all just to make sure.

I reopen the project and the widgets color is changed and saved, but the default variable is back to being blank

How do I fix this?

What is this Hotbar type?
it is marked transient or something?

Not marked as transient. Values are public.

Quick Equip Array type is invgrid (user defined widget). Hotbar and MainInv are invgrid type.

Should I make this a bug report?

I would try clearing your saved/intermediates folder first and see if that clears it up