Due to the fact that offchain election solutions are submitted as an unsigned transaction they can be prevented from inclusion when the on_initialize blocks of any block are taking more weight than AVERAGE_ON_INITIALIZE_RATIO. For more information see this discussion.

Lazy deletions are executed inside an on_initialize block and are able to break the AVERAGE_ON_INITIALIZE_RATIO assumption depending on configuration and load. To avoid this scenario we should tune down or completely remove the amount of work that is done during on_initialize and move it to an upcoming on_idle (#4064) hook.

Please note that the issue with offchain election will be resolved by #7319. The move to the new hook is still useful in order to increase throughput during low utilization.

cc @thiolliere @kianenigma