I've played with a good amount of Air Rifle scopes, probably 100!
Fixed scopes tend to come either parallaxed at 50 or 100m. Rare to find them correct for air rifle ranges. Thats even 4x scopes. You would have to go down as low as 1.75 to get a very crisp picture with set parallax for 50m working to air rifle ranges 25m or under.
Sometimes x4 will be fine, occasionally x6 isn't too bad. Very annoyingly every scope, scope model, does something different.
Unless air rifle range set at factory, then a x3-9 is struggling at 25m at the higher magnification. Often horribly blurred.
Many cheaper scopes can be parallax adjusted down to 25/30m by winding the front lens out a turn or so. Better scopes sometimes can't as the front lens is glued, or there isn't enough thread to wind it out enough. Any movement of the front lens shifts zero, so if moved rezero and leave it alone. Its a scary operation to do.
Annoyingly manufacturers don't really cater for Air Rifle short range parallax, and don't state parallax on the box often. The 50m or 100m is the norm and not crisp enough for 25m.
Front prarallax cheap scopes are notorious for shifting zero after a while with turn of parallax. Find the sweet spot for your normal shooting range and then leave it alone set for the highest magnification; work with that.
Side adjustable parallax tend to be better behaved.
Higher quality scopes tend to work correctly without zero shift.
The scopes I've kept, and have on my springer rifle collection, are ones I've got to be crisp at 20m. Reparallaxing a mint Optima 3-9x45 Moomlighter was scary, but worth the risk. Annoying when a good bright scope can't be got down, and then only being crisp to say x6 rather than x9 or so. The x9 should be ok at about 40m which on a PCP might be ok, but thats a long way for a springer.