ID 519321 - Deleting Shader nodes from the Node Graph does not remove them from the Shaders palette

Problem summary
Deleting Shader nodes from the Node Graph does not remove them from the Shaders palette
 
Customer reported version
Mari 5.v04
 
Customer reported platform
n/a
 
Steps to reproduce
 
1) Create a Shader (with Network) node

2) Open the Shader palette

3) In the Node Graph, delete the Shader node
 
Expected behaviour
The Shader should also be removed from the Shaders palette.
 
Actual behaviour
The Shader remains present in the Shaders palette.
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Mari 5.0v4 - Windows 10 - CentOS 7.9
Mari 4.8v3 - Windows 10 - CentOS 7.9 - regression
 
Unable to reproduce bug in:
Mari 4.8v2 - Windows 10 - CentOS 7.9
 
Earliest version tested
- This issue doesn't appear in this version and has regressed