No leakage inductance of transformer with non-linear core when simulating

Hi there!

Problem: When doing a transient simulation of my flyback converter, there are no inductive spikes from my transformer, which is to be exptected when the coupling is below 1.

I was wondering if anyone here might know why the leakage inductance seemingly isn't included in the spice model for my transformer core. I have tried 3C94 and 3C95 core material from the magnetic library.

Notably, I do see inductive spikes when using K_linear from the analog library without the 3c94/95 core material. When I choose 3C95 in the implementation there are no inductive spikes.

I can of course include this myself, but would like to get confirmation on if this is normal, and perhaps how to best include the leakage inductance in my transformer model.

Thanks