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A tiny overlap can pop loose under vibration or air pulse. Recut/replace the pipe so it seats deep enough in the collar before fastening and sealing.
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You are cut-fitting a round branch line pipe to slide into a start collar. You trim the pipe short, leaving only a frac{1}{4}\text{-inch} metal overlap inside the sleeve collar before zip-screwing the joint. On testing, the vibration pops the pipe loose.
A tiny overlap can pop loose under vibration or air pulse. Recut/replace the pipe so it seats deep enough in the collar before fastening and sealing. The likely recovery is to check the condition, correct prep/setup if it is within your assignment, and bring the foreman clean information before the work creates rework overhead.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.