I wouldn't say I have a pattern. Debugging is like an art. There are rarely two contexts where I can address the exact same way.
What I try to do all the time is to consider the context. I have lost too much time in the past for focusing too much on a single line or function, not understanding why it's failing.
In many cases, bugs are a product of a combination of factors.
Considering the context, what else is going on when the bug was produced, usually allows me to understand the cause faster.
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