WordPress Multisite, by default, allows sharing of plugins, themes and works on the same database. However, it does not allow sharing database tables among sites. This is by design. Each site is unique in terms of database table usage. For example, Site A and Site B can use the same plugin, theme and database but cannot share the same tables.
If you have specific usecase where a WordPress plugin installed in different sites and must use the same data, you should sync the data between the sites either using an external process or a plugin.
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