Up Thrusters not responding properly

Hello.

Me and a few friends of mine have recently started playing Space Engineers on a server together and it has in general been a blast, but we've encountered what I think is a bug that's somewhat game-breaking. We usually create our ships with a connector at the bottom, and upon disconnecting, the ships sometimes can't ascend. All the thrusters are on, all work, and you can see the ship wriggling, kind of tipping forward, backwards or sideways when trying to move and you can also see the flames coming out of the exhausts on the thruster increase in size when moving the ship to these sides.

However, when pressing space to ascend, the vertical thrusters pointing down won't work. They are on, you can see the flame, however when pressing space, the flame doesn't increase in size, the energy usage doesn't change nearly as much as it should, and even when increasing thruster override, the ship won't fly. Changing the hotkey and using that doesn't work either, it's like if the thrusters are off, but they're visually on, and turning them on and off either via hotkeys in groups or individually doesn't help.

What seems to fix it is just jumping in and out of the cockpit a few times, but sometimes this doesn't solve it either. We thought the problem might have been the connector having a magnetic field, or not disconnecting properly, but powering the connector off or straight up removing it doesn't work, the ship just drops straight down. It's not too heavy either, as it can happen with empty cargo ships that can usually carry the weight of at least one or two full large cargo containers when not bugged. It does have fuel, as they are atmospheric thrusters, and we have sufficient power.

I don't know how to re-create it exactly, but we're playing a vanilla Space Engineers server with no mods, a big platform with like 10 connectors connected to a large cargo with conveyors running to all connectors, and sometimes the ships simply won't go upwards. Sometimes it works after jumping in and out of the cockpit or attaching and re-attaching 2-3 times, other times it won't work at all, and the ship's just permanently stuck until we grind it to pieces.

Any help towards solving this issue would be greatly appreciated.