Thanks for your contribution!
The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

Please DO NOT commit the files in dist, i18n, and ssr/client/dist folders in a non-release pull request. These folders are for release use only.

To reviewers: If this PR is going to be described in the changelog in the future release, please make sure this PR has one of the following labels: PR: doc ready, PR: awaiting doc, PR: doc unchanged

This message is shown because the PR description doesn't contain the document related template.

I suggest not fixing this case, as invalid orient are widely used as a workaround for multiple line scroll legend. (16912)

Thanks for the clarification and for sharing the context.

I checked the referenced issue (#16912) as well and understand that fixing this
case was intentionally avoided earlier, since invalid orient values are
already being used by users as a workaround for multi-line scroll legends.
Changing this behavior could break existing usage and affect scenarios where
multiple scroll legends are created.

Given this context, I understand that fixing this case in code might not be
desirable. I’ll wait for your guidance on whether this should be handled via
documentation instead, or if the PR should be closed.