[xkonsole]

root@zplague:/zombieplague/csgo/sound# mv sound.cache sound.cache.bkp
then changed level on server and it mysteriously works now. Thanks for a quick reply tho!

UPD:
moving sound.cache away isn't what "solved" the issue. Map change after srcds start actually does. I guess I'll add "sm_map *something*" to my startup script as temporary workaround.