The original title is: "Some Bugs Aren't in Your Code. They're Hidden in Your Dependencies."

Short summary

A debugging story where identical code behaved differently across two sets of VMs. After hours checking infrastructure, the team traced the issue to an outdated RestSharp version using SimpleJson as its serializer, which had quietly become part of the application's foundation. Updating the serialization approach eliminated the inconsistency, teaching the lesson that hidden dependencies can cause environment-specific bugs.

• •Identical code failed on one set of VMs but worked on another
• •Root cause was outdated RestSharp using SimpleJson serializer, not infrastructure
• •Removing legacy technical debt fixed the issue across all environments

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