Where Does the Guild Stash Go at the End of a Private League?

I had a group trade, private league at the start of Standard Betrayal, and we're all in the same guild.

We put a bunch of stuff in the private league guild stash.

The private league ended 2 weeks later. The tabs did not appear in the Betrayal league guild stash.

Now Betrayal is over, and I still can't locate the guild tabs, even in Standard...

Did they immediately go to the Standard guild stash, and i just didn't think to check there at the time? Or is there a bug?

As the league was parented to Betrayal, i imagined the stash and guild stash would immediately merge there.