Hi,
When the transmission is manufactured, they place a plug in the housing where the dipstick will be mounted. When the tube is installed, it pushes it into the pan and stays there until the pan is removed for service.
Take a look at the pic below and let me know if that looks like what you found.
Take care and Happy Thanksgiving.
Joe
See pic below. Also, if that is what you found, remove it and throw it away. It serves no purpose at this point.
Image (Click to make bigger)
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Wednesday, November 24th, 2021 AT 11:18 PM