Any way to despawn the hierarchy or update the skeleton data safely?

Exporting to JSON or Binary - same error message.
Spine 3.8.86

Sample project attached.

Logs below:

Spine Launcher 3.8.82
Esoteric Software LLC (C) 2013-2020 | http://esotericsoftware.com
Windows 10 Enterprise x86 10.0
Up to date: Spine 3.8.86
Spine 3.8.86 Professional
Licensed to: *****, *****
Intel, Intel(R) UHD Graphics 620, 4.5.0 - Build 24.20.100.6286
Started.
OpenAL 1.1, Default audio device
ERROR: Unable to export:
java.lang.RuntimeException: java.lang.RuntimeException: String not found: 1
at Pb.C(SourceFile:1834)
at CF.I(SourceFile:48)
at AO.run(SourceFile:665)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: String not found: 1
at tb.B(SourceFile:1000)
at sW.I(SourceFile:207)
at sW.I(SourceFile:102)
at sW.I(SourceFile:122)
at CH.run(SourceFile:60)
at Po.run(SourceFile:1822)
at aux.I(SourceFile:289)
at b.run(SourceFile:252)
at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.desktop/java.awt.EventQueue.access$600(Unknown Source)
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)