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Welcome to the Forum!
Couple of things might be wrong -
The internal tank nozzle is plugged with stuff (unlikely)
The vacuum break valve is stuck (likely). The flush hose runs somewhere up the wall of your rig to to an automatic valve, then back down into the tank. The valve opens when you shut off the water supply and allows air back into the line so the water will drain out. This prevents back siphon of the tank contents into the potable water as well as your water inlet. These fail quite a bit. Ours is located behind the shower in the wall, accessed by a removabe plastic panel in the pantry. I'm not sure where it is on your model.
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