ID 482014 - Disabling or deleting a Mix node uses the Blend Factor input for downstream connections

Problem summary
Disabling or deleting a Mix node uses the Blend Factor input for downstream connections

Customer reported version
Mari 4.7v2

Customer reported platform
Multiple

Steps to reproduce

1) Open any project

2) In the Node Graph, create and view a Mix node

3) Create two Color nodes and connect them to inputs A and B of the Mix node

4) Create a Cloud node and connect it to the Blend Factor input of the Mix node

5) Disable the Mix node [D] and observe the rendered output in the Canvas.

Expected behaviour
The result of the Mix node's first input, Input A, should be rendered in the Canvas. In this case, the first Color node.

This would match the current behaviour of Merge nodes.

Actual behaviour
The Mix node's Blend Factor input is rendered in the Canvas. In this case, the Cloud node.

If the Mix node is deleted, the stream that was plugged into the Blend Factor input will then be connected to any nodes downstream.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Mari 4.7v3 - Windows 10 - CentOS 7.7
Mari 4.7v1 - Windows 10
Mari 4.6v1 - Windows 10 - CentOS 7.7

Earliest version tested
Mari 4.6v1 - This feature did not exist before this version