ID 400166 - The baked image set data is not being cleared from Mari's cache even though it has been deleted in the project

Problem summary
The baked image set data is not being cleared from Mari's cache even though it has been deleted in the project 

Customer reported version

Customer reported platform

Steps to reproduce

1) Open Mari and create a new project with the example head and one 16k channel

2) Open the Node Graph > create a procedural Cloud node and connect it to the channel

3) Save > Close the project

4) Check the size of the cache ~ 30 mb

5) Open the project, add a 16k Bake Point after the procedural layer>Bake 

6) Save > Close the project 

7) Check the size of the cache ~ 1.43gb

8) Open the project and delete the Bake data from the node properties and the bake point node all toghter

9) Save > Close > Reopen > Save > Close

10) Check the size of the cache

result: The size of the cache is still ~ 1.43gb even though the baked image set has been deleted 

Expected behaviour
Mari should delete the baked image set from the cache if the user has deleted it from the project 

Actual behaviour
Mari does not clear the cache 

Workaround
Unknown

Reproduced by support

This bug has been reproduced in:
4.5v2 - Windows 10 - CentOS 7

4.0v1 - Windows 10 - regression

Unable to reproduce bug in:

3.4v4 - Windows 10 - CentOS 7 

Earliest version tested
3.4v4 -- This issue no longer appears in this version and has regressed