Subscribers removed from mailing lists

I upgraded to mailpoet 3.81 recently. When customers, that are already subscribed to email lists checkout without checking the “received updates via email” box they are removed from their existing lists.
This is unintentional on their part and I hope also on Mailpoets part. I reverted to MailPoet 3.76 and it’s working again. Existing lists are not changed when checking out.
This change in 3.77 seems like a likely candidate as to why this behavior changed. “Fixed: opting out on WooCommerce checkout doesn’t unsubscribe from other lists configured in MailPoet Settings.”
I haven’t read the bug details but I don’t see how this was incorrect behavior. That’s a pretty subtle side effect that someone would expect to be unsubscribed from their lists when they uncheck this box while placing an order. Seems more appropriate to tell folks to use the unsubscribe link in an email.
There needs to be a way to configure the checkbox to be checked by default if this is an intentional sideeffect. I’ve had multiple customers note/complain that they no longer receive my weekly email updates.