In the following code path

We see a problem when skipInUse alternates between true and false which can cause invalid caching behavior.

Steps to reproduce:
List the minimal actions needed to reproduce the behavior.

1. findGenerations gets called with skipInUse set to true
2. Data is returned and set in last & lastGen
3. findGenerations is called with skipInUse set to false
4. lastGen will be returned due to cached data

Expected behaviour:
I would expect changing the input to invalidate the cache