Unable to enter maintenace mode periodically

##### ISSUE TYPE

* Bug Report

##### COMPONENT NAME

~~~
Maintenance Mode
~~~

##### CLOUDSTACK VERSION

~~~
4.19.1.0
~~~

##### CONFIGURATION

Advanced Networking
Three KVM Hosts, two of the three hosts run the management servers and database (master/replica).

##### OS / ENVIRONMENT

Ubuntu 22.04

##### SUMMARY

When attempting to put hosts into maintenance mode, some instances migrate, but some still remain on the host until it reaches ErrorInMaintenance. When looking at the agent logs on the host that is being vacated, there appears to be no interaction it receives from the management server during these times when an instance is having issues migrating.

Management Server Log snippet:


##### STEPS TO REPRODUCE

~~~
1. Enter a host into maintenance mode
2. Wait for status to change into a permanent state.
~~~

##### EXPECTED RESULTS

~~~
Host enters into maintenance.
~~~

##### ACTUAL RESULTS

~~~
Host enters into ErrorInMaintenance.
~~~

Die Payload nennt keine Quelldateien oder Tests; beginne mit dem Maintenance Mode-Workflow und reproduziere ihn auf dem beschriebenen Setup mit drei Hosts und erweitertem Networking. Vergleiche die Logs des management-server und des agent, wenn Instanzen auf dem Host verbleiben, und betrachte die Arbeit als abgeschlossen, wenn der Host maintenance statt ErrorInMaintenance erreicht.

Vom Indexierungsmodell aus dem Issue-Text verfasst.