ID 569220 - Deleting annotation does not delete from client asset cache

Problem summary
Deleting annotation does not delete from client asset cache

Customer reported version
flix_6.6.2

Customer reported platform
windows10

Steps to reproduce

1. Create an annotation
2. Check if the annotation asset cache is in the local asset cache folder (set in the client preferences). You might need to move out from the revision and go back.
3. Click the bin button in the annotation tool
4. Check the Flix asset cache folder 

Expected behaviour
The annotation asset cache should be deleted.

Actual behaviour
The annotation asset cache file remains in the folder.

Workaround
Manually go and clear the annotation asset cache.

Reproduced by support
Flix 6.6.2