I feel like this is a pretty crass joke to make.
A good friend of mine found a body a few months ago. It’s a pretty shitty experience. And it’s actually a lot like what OP describes. A sense of foreboding and suspicion combined with a conviction that these thoughts are foolish. And an uncertainty whether to check or to alert someone or to just try to forget it.
Op, I’d report it and ask them to please follow up with you and let you know. It’s probably nothing, and you’ll feel better once you know it was nothing, and that you did the responsible thing in having it dealt with.
This looks like a clog caused by retraction.
Is it clogged when it finishes? Also, does the cooling change at this layer? Is there anything specific to this layer?