Originally Posted by
IB-Dick
I've finally been able to replicate this!! My problem is that my account is set to automatically subscribe to threads I post in, and that function actually works when replying from the app. If you don't have this setting set and you reply to a thread you're subscribed to, it removes your subscription.
From what you wrote I think your check also came up with this, but for your reference, if I access the subscribed thread the hard way (by navigating to it) then reply, my subscription is also removed.