Which version and edition of Flyway are you using?

We currently use version 9.22.0

If this is not the latest version, can you reproduce the issue with the latest one as well? (Many bugs are fixed in newer releases and upgrading will often resolve the issue)

I also tried it on 10.0.0 (i used the command line since flyway is currently broken with spring boot) but still same issue

Which client are you using? (Command-line, Java API, Maven plugin, Gradle plugin)

We use the Java Api together with spring boot

Which database are you using? (Type & version)

Postgresql 13

Which operating system are you using?

MacOS / Debian

What did you do? (Please include the content causing the issue, any relevant configuration settings, the SQL statement(s) that failed (if any), and the command you ran)

I first created a migration which creates a collation.

CREATE COLLATION german (provider = icu, locale = 'de-DE');

And applied it

Then I ran flyway with these command line arguments:
clean -url="jdbc:postgresql://localhost:5432/test" -user=postgres -cleanDisabled=false

What did you expect to see?

I expected that the collations are cleaned up after the clean command was run.

What did you see instead?

The collations where still persisted in the schema