Solved
Rules Manager Filter By Rule Source Object Doesn't respect Bionic Rules
It is found that in rules manager, when you use the magnifying glass to toggle/show rules that use a certain source object, it doesn't respect source objects used in bionic rules.
For example, if you have a custom rule sourcing SFDC Contact object called "Rule 1" and a bionic rule having a task sourcing off Contact object called "Rule 2". Using source object filter, only "Rule 1" appears in filtered list.
Edit: As a workaround if your sourcing MDA, you can view dependencies via data management in the following desired object.
For example, if you have a custom rule sourcing SFDC Contact object called "Rule 1" and a bionic rule having a task sourcing off Contact object called "Rule 2". Using source object filter, only "Rule 1" appears in filtered list.
Edit: As a workaround if your sourcing MDA, you can view dependencies via data management in the following desired object.