No old photos shown in resubscribed old shared album

I started with having a problem open up a new shared album which I end up turned off the shared album function without knowing all photos will be deleted after that action. I then turned the function back on, but shared album still empty.

A few days later, as I wanted to find old photos from one of those deleted shared albums, I asked my friend who is in those albums to invite me again into it. That action required her to delete me from the albums (which for some reason I was still on those albums’ participant list on my friend’s phone) And It didn’t work, I still couldn’t resubscribe those album.

So I tried turned off the shared album function again and turn it back on. Old albums started to pop up! But not the one album my friend deleted me from to resubscribe.

So I wonder if after unsubscribing an shared album / being deleted from it would not allow you to have those old photos back when you resubscribing it again?🤔 Now I’m not sure if it is only a delayed/ faulty reaction that those photos might show up again if I try to reboot the shared album function again.