if you take talent “Secret Technique” damage of ability consists of 2 portion: standart hit of ability and damage that images do. first portion of damage shows correctly but pet damage shows as separate actor. this bug exists in every single log with this talent. for example:
https://www.warcraftlogs.com/reports/3zQDvbHYWB2PLCNG/#fight=last&type=damage-done&translate=true
https://www.warcraftlogs.com/reports/7d4Mpn8cALFvQhVa#fight=48&type=damage-done
https://www.warcraftlogs.com/reports/tnzLA2mayN81QT73#fight=8&type=damage-done
when there is 2 rogues in party with this tallent damage from both pets combined in one row https://www.warcraftlogs.com/reports/zCWhF8ycBxJ3PvrR#fight=22&type=damage-done
even if blizzard ruin something with pet owner in logs there is enough information in logs to correctly associate these pets with right owners. may be blizzard will newer fix it like dozen other problems with logs which exists for years. (here i mean that there are lot of raid boss debuffs that don’t generate ingame events and so don’t exist in logs)