Frost mage damage does not stack with damage water elemental

The frost mage damage does not stack with damage water elemental. Everything considered separately. This bug has been around for about a month. Сorrect please.

For example
https://www.warcraftlogs.com/reports/WA2LV8T7w1QbaDgd#type=damage-done
https://www.warcraftlogs.com/reports/by2qPjDM381hrdVv#type=damage-done
https://www.warcraftlogs.com/reports/6kBMLAdRVrqtY3Zj#type=damage-done

You need to enable Advanced Combat Logging. Network pane of System preferences in WoW.

This feature reduces the ping in the game.

Without Advanced Combat Logging, I can only associate a pet to its owner if I see a summon event. If you insist on logging without the feature turned on (not recommended, since lots of things are wrong with ACL off), then make sure you summon your elemental while logging.