[I] Throw CannotResolveClassException: OpenModelThreadGroup when I use SaveService.loadTree() method load the jmx file. [jmeter]

[via GitHub]

wzhfeianei opened a new issue, #6394:
URL: https://github.com/apache/jmeter/issues/6394

   ### Expected behavior
   
   I hope use SaveService.loadTree() load contain OpenModelThreadGroup jmx 
file,but it throw CannotResolveClassException
   
   ### Actual behavior
   
   throw CannotResolveClassException
   
   ### Steps to reproduce the problem
   
   1. use jemter gui create a jmx script file it contain OpenModelThreadGroup 
feature 
   
![image](https://github.com/user-attachments/assets/03a10b08-daaa-4727-9e71-fb9d4a237b29)
   2. use SaveService.loadTree() method load the jmx file 
   3. throw Exception
   java.lang.IllegalArgumentException: Problem loading XML 
from:'/Users/m/git/service/6760ea60488693106d67df19.jmx'. 
   Cause:
   CannotResolveClassException: OpenModelThreadGroup
   
    Detail:com.thoughtworks.xstream.converters.ConversionException: 
   ---- Debugging information ----
   cause-exception     : com.thoughtworks.xstream.converters.ConversionException
   cause-message       : 
   first-jmeter-class  : 
org.apache.jmeter.save.converters.HashTreeConverter.unmarshal(HashTreeConverter.java:66)
   class               : org.apache.jmeter.save.ScriptWrapper
   required-type       : org.apache.jmeter.save.ScriptWrapper
   converter-type      : org.apache.jmeter.save.ScriptWrapperConverter
   path                : /jmeterTestPlan/hashTree/hashTree/OpenModelThreadGroup
   line number         : 10
   version             : 5.6.3
   -------------------------------
        at org.apache.jmeter.save.SaveService.readTree(SaveService.java:456)
        at org.apache.jmeter.save.SaveService.loadTree(SaveService.java:429)
   
   ### JMeter Version
   
   5.6.3
   
   ### Java Version
   
   8
   
   ### OS Version
   
   mac 14.6.1


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