QoS on Linux: tc doesn't see RTP traffic

I have a camera that creates RTSP traffic. I connected it to a Linux PC via Ethernet, configured the network and access. But when I tried to apply QoS rules, the tc statistics showed that too few bytes were sent. After some research, I found that HTTP, SSH and RTSP (connection) traffic from the camera was displayed correctly in the statistics. However, tc seems to work differently with RTP traffic. Video in VLC was playing, nft and tcpdump showed traffic. I tried using Debian 12, Ubuntu 24.04, Manjaro - it still didn't work. Imitating RTP with FFMPEG also did not bring success. This seems really weird and I didn't know what could cause the problem or what else to try.