The reason we require confirmation from the other party is because there may be cases where the super donator cancellation will also cancel their streak. After investigating though, there are a few things that can certainly be polished up with Duo Slayer, including smoother notifications when partnering with players, as well as improving synchronization when cancelling a task. We can also make it so that if the partner has no slayer streak then it will automatically accept the cancel, and that will make issues like this no longer possible (since if you're skipping more than once using the free skips, the partner will no longer have a streak).
Your suggestion has been accepted. This, along with some other items such as skull sceptre pieces/functionality, granite armour, metal boots, and others will be coming next update.
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