Silentvanished joining people are visible via tablist(Tab) for players who are already on the server.

Using:
Latest Spigot 1.11.2-Build
Latest EssentialsX-Build
zPermissions

Same problem on my server.
Online players can see new connected admins with silentjoin permissions in the tablist.
We are using one of the latest versions of Paper.

If this is still an issue, could you post the full output of /ess version? This is likely a duplicate of the known vanish list duplication bug.

Closing due to lack of response. If this is still a problem, feel free to respond and reopen the issue.

Can you confirm if this is still an issue?

yeah, it´s still an issue on our server