Fix detection of existing tasks

[hendrikmakait]

Closes #8959

• Tests added / passed
• Passes pre-commit run --all-files

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

    29 files  ±0      29 suites  ±0   12h 21m 45s ⏱️ + 2m 10s
 4 130 tests ±0   4 014 ✅ +2    111 💤 ±0   5 ❌  - 2 
55 839 runs  ±0  53 388 ✅ +3  2 426 💤 ±0  25 ❌  - 3 

For more details on these failures, see this check.

Results for commit 7b58d6e. ± Comparison against base commit 6c3b8ad.