Insert cursor: Shape.STArea() and Length not updating?

[MKF62]

Upon inserting a polygon (fgdb) into another polygon feature class (sde database), I've noticed that the inserted polygon has null for Shape.STArea() and Shape.STLength(). I thought these were supposed to be automatically calculated and updated upon inserting any shape using any method. Is that not the case? Do I need to take Shape_Area and Shape_Length, put them in my row, and then insert those values as Shape.STArea and Length?

ArcMap 10.7

[MKF62]

I don't have an answer to my question, but I'm just going to use append which is probably a more proper way to do it anyway.

[DavidPike]

I think you could copy across just the SHAPE@ token and it would contain those attributes, but that's really just a guess. Or try running calculate geometry.