If PFB applied over the current PFB, both will be expired, new PFB will be lost.

Appears after the last hotfix.

Your PFB expires in X minutes. Your friend buffs the zone with a new PFB. Visually all good and you see a message that you have 15(16)d 59min.
Once the old PFB expires, the new one will be removed too (tada).

So apply a new PFB only when the old one is fully gone.

Thanks

Shoot, had a pfb dropped this morning, the other one was still running for 12 hours.
Just logged in and indeed, new pfb disappeared. Great job again from BB
Did you place a ticket? Any reaction?