I've tried with removing them only.
Currently my iptv.m3u looks like following:
#EXTM3U
#EXTINF:0 group-title="Movies",NHKWorldTV
udp://239.255.1.12:1234
#EXTINF:0 group-title="Movies",STarSportsHD1
udp://239.255.1.2:1234
#EXTINF:0 group-title="Movies",StarMoviesHD
udp://239.255.1.4:1234
#EXTINF:0 group-title="Movies",ServusTv
udp://239.255.1.5:1234
And all feeds are available if I run with adding muxes manually.