Duplicate items in “Required Memberships” column for custom post types

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I’m using WP-Members to restrict access to a custom post type. When I enable membership creation and create a membership, then add it to a post of the custom post type, the “Required Membership” column in the posts listing displays each membership twice. For example, if I add a required membership called “lesson01”, it gets displayed as “lesson01lesson01”. If I add “lesson01” and “lesson02”, they get displayed as “lesson01, lesson02lesson01, lesson02”.

This issue occurs on custom post types but not the default post type or the pages post type.

I tested it on a fresh installation of WordPress, and the issue persists.