Trouble Testing UpsertRequest with FakeXrm Version 2.4.2

[ZimIrina]

Hello! I'm having trouble testing UpsertRequest. FakeXrm version 2.4.2. Late bound. Testing the plugin code:

 var entityRef = ((UpsertResponse)service.Execute(new UpsertRequest
 {
    Target = new Entity("entitynme")
 {
    KeyAttributes = { ["parententityid"] = parentRef },
      ["field2"] = 1
 }
 })).Target;

[...]

var query = new QueryExpression("entityname")
{
   TopCount = 1,
   NoLock = true,
   ColumnSet = new ColumnSet("field1"),
   Criteria = { Conditions = { new ConditionExpression("parententityid", 
   ConditionOperator.Equal, patientRef.Id) } }
};

var records = service.RetrieveMultiple(query).Entities; //here error

Before this, I added metadata for the key to the test

var entityMetadata = new EntityMetadata
 {
 LogicalName = "entityname",

 };

 var parentAttribute = new LookupAttributeMetadata
 {
     SchemaName = "parententityid",
     RequiredLevel = new AttributeRequiredLevelManagedProperty(AttributeRequiredLevel.None),
     Targets = ["parententityname" ],
     DisplayName = new Label("Parent", 1033),
     Description = new Label("Parent", 1033)
 };

 entityMetadata .SetAttributeCollection(new List<AttributeMetadata> { parentAttribute });

 entityMetadata .SetFieldValue("_keys", new[]
 {
 new EntityKeyMetadata
 {
    KeyAttributes = ["parententityid"]
 }
 });

 Context.InitializeMetadata(entityMetadata);

and create a record

var parent = new Entity("parententityname", Guid.NewGuid()){};
 
 var record = new Entity("entityname", Guid.NewGuid())
 {
     ["parententityid"] = parent.ToEntityReference(),
     ["f2"] = 3
 };

Context.Initialize([parent, record]

then run plugin. The error occurs on the line service.RetrieveMultiple: System.ServiceModel.FaultException1: 'The attribute parententityid does not exist on this entity.'

Please advise what needs to be corrected. Thank you in advance!

Details:
<package id="FakeItEasy" version="6.2.1" targetFramework="net462" />
 <package id="FakeXrmEasy.Abstractions.v9" version="2.4.0" targetFramework="net462" />
 <package id="FakeXrmEasy.CodeActivities.v9" version="2.4.0" targetFramework="net462" />
 <package id="FakeXrmEasy.Core.v9" version="2.4.2" targetFramework="net462" />
 <package id="FakeXrmEasy.Messages.v9" version="2.4.0" targetFramework="net462" />
 <package id="FakeXrmEasy.Plugins.v9" version="2.4.1" targetFramework="net462" />
 <package id="FakeXrmEasy.v9" version="2.4.2" targetFramework="net462" />