Description

This PR updates tests based on #1048

changing inheritance order requires initialization where previously not neede
adding another arg to merge_fetch prevented calling attrs as positional arguments

Checklist:

[X] No. This PR should be accompanied by a release: (yes/no/unsure)
[X] N/a. If release, I have updated the CITATION.cff
[X] No. This PR makes edits to table definitions: (yes/no)
[X] N/a. If table edits, I have included an alter snippet for release notes.
[X] N/a. If this PR makes changes to position, I ran the relevant tests locally.
[X] I have updated the CHANGELOG.md with PR number and description.
[X] N/a. I have added/edited docs/notebooks to reflect the changes