Cron Event Def broke, is no longer running despite being enabled

I have an event def that is triggered every day and usually multiple times a day. It has not triggered since 5/12 despite there being logs that should have triggered it.

The event def appears to not be actually scheduled/running.

For context this seemed to occur after updating the kernel from 5.x to 6.8. Not sure if that is relevant. This is the last graylog was started/restarted (May 12)

## Expected Behavior

Event Defs do not suddenly and unexpectedly break.

## Current Behavior

Cron Event Def no longer works.

## Possible Solution

## Steps to Reproduce (for bugs)

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## Context

## Your Environment

* Graylog Version:
* Java Version:
* OpenSearch Version:
* MongoDB Version:
* Operating System:
* Browser version:

## Checklist
[] This issue fix need to be backported.
[] Does this issue have **security** implications?