Quick answer: Unreal Blueprint event graph silently skipping execution past a node with an error pin? Error pins don't break execution; subsequent logic uses default values - check Error and branch.
Async load completes with error; subsequent nodes use null result; crash.
Branch on error
Each node with error pin: explicit branch. Success and error paths.
Or treat errors as exceptions
Error pin = log + abort. Defensive.
Audit error pins
Each error pin's handling. Default-skip is the bug source.
“Blueprint error pins are informational. They don't gate execution.”
If your blueprints have async or fallible ops, the error-pin branching is mandatory.