iOS: question about sandbox opt-out behavior for auto-renewal subscription.

Hi. Thanks in advance.

I have simple question regarding apple sandbox behavior via revenuecat.

I have monthly subscription and when I makePurchase monthly subscription, 

I can see it will auto-renew for 11 month then opted-outs (probably cancelled from apple)

then expires.

After expiration, when I re-purchase monthly again, then it opted-outs by 1 month.

Is this as expected? Is there any this opted-out rules?

thank you