Timer stops running for 'notice-session-expiration-by-timeout' after heartbeat timeout

Overview:
Issue is observed in a Morning Glory environment (okapi 4.14.4)

Environment is running 3 okapi tasks and timers are running without issue

In the log, we can see messages regarding a timeout heartbeattimeout.txt after which we observe that the timer for `notice-session-expiration-by-timeout` is no longer executing.

Steps to reproduce are difficult (as scenario observed after a timeout)

Expected Results:
notice-session-expiration-by-timeout timer continues to work

Actual Results:
notice-session-expiration-by-timeout timer stops working

Additional Information:
Worked around issue by bringing count of okapi tasks down from 3 to 1 - after which timers began working again.
Gradually brought task count back to 3

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