Package bucket.user.propertyset is internal and is not available for export to plugin com.keysight.test-ecosystem

Hi, I’m trying to update a number of Keysight’s open source plugins for Confluence 9.0. I’m struggling with the import changes.

One of my plugins has a dependency on the confluence-create-content-plugin:

        <dependency>
            <groupId>com.atlassian.confluence.plugins</groupId>
            <artifactId>confluence-create-content-plugin</artifactId>
            <scope>compile</scope>
            <version>19.3.51</version>
        </dependency>

It builds, but when I try to load it I’m getting the error

Package bucket.user.propertyset is internal and is not available for export to plugin com.keysight.test-ecosystem

I’ve been scouring the documentation, flipping the dependency from provided to compile. The ‘bucket.user.propertyset’ is provided by the System Bundle, so I’ve been unable to figure a way to include it or find a different bundle with the code. Any advice on how to break through this wall?