Zero notifications from a node

[eDaddi]

On one of my sites the Mod's private forum has stopped sending out any type of notifications. No Alerts, emails, push notifications ...

• The node's 'Forum watch notification limit' is set to 'New messages'.
• Analyzing the Mod's permissions on the node shows correct permissions.
• We do visit the node often enough to keep them live.
• Mods get notifications on other nodes/msgs.

What am I not checking?
Zero notifications from a node

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