`lazy: false` seems not work in Grails 3.3.5.

Hi, I use Grails3.3.5, `lazy: false` seems not work. When execute `Airport.findByName("Gatwick")`, only one SQL statement generated. But if I change it to `fetch: 'join'`, it works well.

```
| OS: macOS 10.13.5
| Grails Version: 3.3.5
| Groovy Version: 2.4.15
| JVM Version: 1.8.0_111
```

```groovy
// Domain Classes
class Airport {
String name
static hasMany = [flights: Flight]

static mapping = {
flights lazy: false
}
}
class Flight {
String number
Location destination
static belongsTo = [airport: Airport]
}
class Location {
String city
String country
}
```

```groovy
// Controller
def airport = Airport.findByName("Gatwick")
println 'start access data...'
println ''

for (flight in airport.flights) {
println ''
println 'load Location data...'
println flight.destination.city
}
```

```
// log
Hibernate: select this_.id as id1_0_0_, this_.version as version2_0_0_, this_.name as name3_0_0_ from airport this_ where this_.name=? limit ?

start access data...

Hibernate: select flights0_.airport_id as airport_5_1_0_, flights0_.id as id1_1_0_, flights0_.id as id1_1_1_, flights0_.version as version2_1_1_, flights0_.number as number3_1_1_, flights0_.destination_id as destinat4_1_1_, flights0_.airport_id as airport_5_1_1_ from flight flights0_ where flights0_.airport_id=?

load Location data...
Hibernate: select location0_.id as id1_4_0_, location0_.version as version2_4_0_, location0_.city as city3_4_0_, location0_.country as country4_4_0_ from location location0_ where location0_.id=?

load Location data...
Hibernate: select location0_.id as id1_4_0_, location0_.version as version2_4_0_, location0_.city as city3_4_0_, location0_.country as country4_4_0_ from location location0_ where location0_.id=?
```

Start with the Airport, Flight, and Location domain mappings and the controller query shown in the report. Reproduce the generated SQL for lazy: false and fetch: 'join', then trace how airport.flights and flight.destination are loaded. Done means the reported eager-loading behavior is understood and covered by a regression test.

Written by the indexing model from the issue text.