Azure Function App - reference to external assembly doesn't trigger the function

Question

We have a C#.net 6.0 based Azure Function App (Timer triggered) deployed on Linux environment, which references a .Net 6.0 class library having some business logic implemented. When the function is deployed without external library reference, it gets invoked at the defined trigger frequency, however, when a external library is referenced, the function is not triggered.

Please suggest how to deploy the c#.net trigger based function app that references an external c#.net based custom class library that has project specific business logic.