Fault found thanks to your support. The cause, as usual, proved to be prosaic. I have a non-original belt tensioner in Spyder. This tensioner came loose and his arm hit the lower belt cover. It seems that when the engine was not warmed up, it caused more vibration and when starting, tapping the tensioner on the belt cover, during further driving this knocking did not appear anymore.
Thanks to everyone who tried to help me by giving advice and sharing experiences from which I could learn a lot.
Greetings from Lower Silesia - Marek