Tahoe 26.4 guest on Sonoma host: hangs and missing icons

[iccir]

Describe the issue

I updated a Sequoia guest VM to Tahoe via Software Update. I am encountering frequent hangs and I'm seeing several missing icons.

I believe this to be related to iconservicesagent crashing. There are several messages in console:

Subsystem: com.apple.iconservices
Category: default

Unknown device class: 9

Is UTM setting the device class to 9? Is this Virtualization.framework? I have tried to reinstall Tahoe multiple times as well as Erase Contents and Settings on the VM to no effect.

Configuration

• UTM Version: 4.7.5
• macOS Version: 14.7.8
• Mac Chip (Intel, M1, ...): M2 Ultra

Upload VM

config.plist.zip

iconservicesagent-2026-03-28-095017.ips.zip