Freenas ISCSI Question

I’m a beginner to freenas & iscsi. I created a zvol, created an iscsi target and pointed windows 10 at it, tested with some data…all good.

As part of learning I messed with the iscsi settings in freenas, changed portal, target name and even renamed the freenas initiator iqn. Went back to windows and can see the iscsi mount WITH the new details but WITHOUT the old data, needs initialising again…even though I am still pointed at the same original zvol.

Not too worried about the data as this was more educational, but if I wanted to get this data back how would I go about it, is this behaviour expected and is there another way to mount the zvol?