If you check the inner mouth there is a inner ridge that actually prevents the nozzle from going in too deep, but if it is pushed too hard the nozzle will sink past that part and will get stuck inside the bottle.
A good gauge: The nozzle should have one black band peeking above the bottle mouth when in use, that’s enough for it to work well without the problem of getting stuck inside.
If the nozzle gets stuck in the bottle, it can be pulled out using the following method:
Bend the bottle close to the base and feel for the nozzle,
Then, use some force to push the nozzle out.
This method will not damage the nozzle at all, however do be careful while pushing it out and do it in a clear unobstructed area with no one in front of you.