Hi @Maximilian W,
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to "Accept " the answer.
Issue:
Source Control on Automation Account not starting on new commit?
Solution:
Ensure you sync before committing to avoid a merge; otherwise, source control won’t register it as a new commit for incremental sync.
If you have any other questions or are still running into more issues, please let me know. Thank you again for your time and patience throughout this issue.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.
https://learn.microsoft.com/en-us/answers/support/accept-answer#why-only-one-accepted-answer
Accept answers on Microsoft Q&A | Microsoft Learn
An accepted answer is the answer that the person who asked the question chooses as the one they think best solves their problem.