Thanks for reminding me. I did check everything, including the fragile bolt stop. This gun was not bought for shooting, but I was a little crazy these days. By shooting those things, I have broken the sear spring of a FN 1906 .25ACP pistol, and the sear arm of a Mauser Modell 1930
Found a replacement sear arm for the 1930 (thanks Tom H). It worked again. So this 9m/m returned back to safe. The tiny FN pistol is still in broken mode. Those are unnumbered parts, but finding them still take some effort. Fun came with cost.