Magic Items in combat transformation?

[rabelais]

Did a search, couldn't find the answer sorry if this has been previously discussed.

What happens to magic items that you no longer have slots for when transforming IN COMBAT?

I know they go to the lab (does there need to be one in the prov for this to work?) if it's a ritual effect, but not sure what happens when it's an automatic ability.

Do the items still affect you?

Do they disappear into the ether (i.e. as if dropped, ... in which case are they picked up

1. automatically
2. via normal rules
3. Not at all (poof!) )

In other words, under what conditions do they not function/reappear?

Thanks,

Rabe the Wondering-where-his-pockets-went....