I had a PP in .2LR which was a fine gun. It was not the sport model, just a regular PP in .22. It was about as accurate as one could be made and was generally reliable.
I later bought a Hungarian copy which was nearly as accurate and more reliable. Since it only cost $115 and came with a spare mag, I did not worry about carrying it in a pocket.
I liked the little .22 FEG so much that I got a .380 which is also reliable and accurate. It too came with a spare mag.
The gun that I usually stick in my pocket while roaming the woods or just my back yard is a Unique Model L, .22. It is smaller and lighter than the Walthers yet has the same length barrel.
The little Unique has never jammed or failed to feed but about once in 50 rounds it will fail to ignite. Cocking the hammer again, it always fires on the second try. I wish it were 100% but I can live with it. It is such a neat gun in every other way.
Check for crud around the firing pin, if you haven’t already. One little flake of gunk could be enough to cause the malfunction (insufficient force to ignite the primer). Old/excess lubricant could do it also, and in cold weather just about anything not rated for arctic use will tend to gel.
My favorite little pocket .22 is the 8 shot S&W 317 airweight snub nose revolver. very light, carries in a uncle mikes cheap pocket holster comfortably .
TUFF brand products even makes a speed strip for carrying spare rounds safely.
loaded with quality or crap fodder its reliable...... stay safe !!