Whether any particular AR .22 upper, be it a dedicated upper assembly or conversion assembly installed in a 5.56/.223 upper, will function reliably with any particular .22 ammo, be it standard velocity, high velocity, subsonic, etc., depends on a number of factors. The following are things that come to mind and so the list should not be consider all inclusive.
For the upper: barrel length; suppressed or not suppressed, and if suppressed, the amount of boost provided by the silencer; degree of chamfer (‘throating’) to the lower lip of the chamber; correctness/completeness of seating the barrel into the upper; and tolerances of manufacture of the upper and barrel vis a vis each other.
For the .22 bolt/recoil assembly: recoil spring rate (too high and too low); degree of roughness on the interfacing surfaces including how well the firing pin and extractor move in their channels; total reciprocating weight (too high and too low); tolerances of manufacture of the components vis a vis the barrel, the upper receiver, and the lower receiver; mag spring force and mag lip drag caused by the mag or the bolt.
For the firearm: tolerances of manufacture of the components including the lower receiver; hammer, trigger, and disconnector spring rates; hammer mass; and degree of roughness on the interfacing surfaces. When used in connection with a closed bolt full auto firearm (e.g., M16), the forward momentum required to trip the auto sear.
For the ammo: ammo power factor taking the barrel length and suppression effects, if any, into account; ammo coating (e.g., dry wax, oily wax, copper wash, etc.); projectile shape (e.g., round nose, truncated, hollow point, etc.); and casing thickness, particularly in the rim.
Best of luck.
MHO, YMMV, etc. Be well.