Thanks for testing. I had a look at the test failures, and after commit 67c20979 [1], a warning for creating a publication is only issued when the wal_level is set to minimal. I've updated the test output to reflect this and attached v2 of the patch.
I tested this patch on my current branch. The patch applied cleanly and all relevant regression tests got passed, including publication, subscription, dependency, and ALTER TABLE coverage. The behavior matches the intended semantics: ALTER COLUMN TYPE is allowed for columns used only in publication column lists, while remaining blocked when the column is referenced in a row filter. I see a failure in the rules regression test in my environment, but this also occurs without the patch and this appears unrelated. From my testing, the patch looks correct and ready for further review. Please let me know if any further testing or clarification would be helpful.
