GORM query does not return expected results during unit testing

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### Task List

- [x] Steps to reproduce provided
- [x] Example that reproduces the problem uploaded to Github
- [x] Full description of the issue provided (see below)
- [x] Stacktrace (if present) provided

### Steps to Reproduce

1. Create 5 linked domain classes (A, B, C, D, E), such that:
**A hasMany B, B hasMany C, C hasMany D, D hasMany E**
2. Create a service class method to query for E as follows:
```
List listEMethod(A instanceOfA){
List listE = E.where {
(isSomeAttribute == true) && (d.c.b.a == instanceOfA)
}.list()
return listE
}
```
3. Write a unite test to test `listE` as follows

```
void "Test listE method"() {
given:
A instanceOfA = new A(name: 'iName').save(flush: true, failOnError: true)
B instanceOfB = new B(a: instanceOfA).save(flush: true, failOnError: true)
C instanceOfC = new C(b: instanceOfB).save(flush: true, failOnError: true)
D instanceOfD = new D(c: instanceOfC).save(flush: true, failOnError: true)

10.times {
new E(d: instanceOfD, isSomeAttribute: true ).save(flush: true, failOnError: true)
}

when:
List sampleList = E.findAllByisSomeAttribute(true)

then:
sampleList.size() == 10 **// This passes**
sampleList.every { it.d.c.b.a == instanceOfA } **//This passes**

when:
List result = service.listEMethod(instanceOfA)

then:
result.size() == 10 //This fails
}
```

### Expected Behaviour

**The last assertion should pass**

```
void "Test listE method"() {
given:
A instanceOfA = new A(name: 'iName').save(flush: true, failOnError: true)
B instanceOfB = new B(a: instanceOfA).save(flush: true, failOnError: true)
C instanceOfC = new C(b: instanceOfB).save(flush: true, failOnError: true)
D instanceOfD = new D(c: instanceOfC).save(flush: true, failOnError: true)

10.times {
new E(d: instanceOfD, isSomeAttribute: true ).save(flush: true, failOnError: true)
}

when:
List sampleList = E.findAllByisSomeAttribute(true)

then:
sampleList.size() == 10 **// This passes**
sampleList.every { it.d.c.b.a == instanceOfA } **//This passes**

when:
List result = service.listEMethod(instanceOfA)

then:
result.size() == 10 //This Should pass
}

```
### Actual Behaviour

**See steps to reproduce above**

### Environment Information

- **Operating System**: MacOS Sierra
- **GORM Version:** 6.1.9.RELEASE
- **Grails Version (if using Grails):** 3.3.6
- **JDK Version:** TODO

### Example Application

- TODO: [Sample Application](https://github.com/TeyimPila/sampleGrailsApp)

Start with the service.listEMethod entry point and the E.where query shown in the reproduction, then compare it with E.findAllByisSomeAttribute(true) in the unit test. Done means the chained association query returns 10 E records for the supplied A instance, matching the direct query.

Written by the indexing model from the issue text.