I still have this problem, and now in Unreal 5.4 there are more methods with the same issue, (i.e. UTextureRenderTarget2D::GetTextureUClass(), UTextureRenderTarget2D::CanConvertToTexture, UTextureRenderTarget2D::GetFormat(), etc), I am needing to copy the implementation of them all to make it work.
Also the hotreload always crash with this error when inheriting UCanvasRenderTarget2D:
Tried to get the current ObjectInitializer, but none is set. Please use NewObject to construct new UObject-derived classes.