SharePoint Hub Navigation Disappears in Associated Sites

Melito, thank you for the helpful questions!

1) Our users have read and edit access to the full site on the hub, but due to concerns around file security, the users only have read access to the Site Pages and Site Assets library on the division sites (the associated sites). The links they use to navigate to a site page are directly to the home page in the Site Pages library.

2) The hub is a communications site, with Server Publishing disabled.

3) We only recently expanded the security model to allow users to see each other's home pages - the org has been somewhat siloed historically. This has been occurring throughout testing and deployment.