Mail Graphs not displayed for services with more than 1 graphs

Greetings,

We are using CheckMK Enterprise v1.6.0p20 and we noticed that mail graphs are empty when they are sent for a service which has more than 1 graph in it. But only for any other host except CheckMK Application Nodes.

Full details:
We are using 3 Application Nodes in Distributed Monitoring, and only the master one has WATO and rest of stuff, for the other nodes is disabled.

We receive only the notifications with full graphs for the Application Nodes hosts agents and for services which have only 1 graph.

For any other services the graphs are generated, they contain the thresholds but they do not have the data populated in them. (screenshot attached )

Could you please give us a hand?

Thank you

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