My GM tries to keep the game moving by not allowing for in-party discussion or out-of-character questions or remarks.
For example, our party travels across town to an NPC's place with the intention of interrogating and intimidating them once we arrive. The GM skips over our travel or any preparation we may have needed, and states that we are now gathered in front of the NPC's door. We voice to hold on a second and discuss among ourselves what tactics we're going to employ before we enter, including out-of-character discussion such as the mechanics of how abilities or equipment work. The GM then states that the NPC heard our discussion on the other side of the door and took actions.
I feel very frustrated that the opportunity to plan is being taken away and that we can't even have, obviously, out-of-character discussions without time continuing to pass in game. I understand wanting to keep the game moving and staying immersed, but there's literally no opportunities to pause even for rules clarifications.
What can I do to have the GM allow us time to talk?