Cache invalidation problem

[okayawright]

Some cached data are sent back from the API whereas they should have been invalidated

Bug Report

Steps to Reproduce

1. Activate the cache on the API (e.g. through memcache or apcu)
2. Create a collection through the APP or API
3. Retrieve at least once the content of this collection through the APP or API
4. Add a new entry to this collection through the APP or API and save it
5. Retrieve the collection content once again through the APP or API and observe the data sent back

Expected Behavior

The new entry must appear in the collection content

Actual Behavior

This entry is not visible

Other Context & Screenshots

The cache is not invalidated after performing some important actions, the fresh collection data is not always sent back from the API

Technical Details

latest master