Disabling Completionist conflicts with Questie in Cataclysm

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Game Flavor (please complete the following information):

• Flavor: Cataclysm

Describe the bug
Hey there, on of the Questie developers here.
It looks like something in ATT is conflicting with Questie on startup. We managed to pin it down to having the "+Source" setting inactive.

It causes, that C_QuestLog.GetQuestObjectives returns invalid objectives, as if they are not cached yet. It might simply be, because both addons are firing at the API "too much", can't tell though.

When flipping the load order of both addons by renaming ATT to XATT (directory and _Cata.toc), then Questie initializes correctly.

To Reproduce
Steps to reproduce the behavior:

1. Install Questie and ATT
2. Log in on a character with a few quests
3. Remember the amount of quests in the Questie Tracker
4. Disable "+Source" setting in ATT (all other settings to default.
5. /reload
6. Compare the amount of quests in the Questie Tracker

(The Questie Tracker is only showing quests which make it into the game cache).

Expected behavior
Both addons should initialize correctly. It would be great to get in touch what possibilities we see and if there is something that can potentially be done on ATTs side.

Screenshots

Additional context
Questie v10.3.8 + ATT 4.0.1