There is no code requirement to tag abandoned power conductors.
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It actually a non-metallic NM cable clamp inserted backwards from the inside instead of the outside.
SKU: 621-NM
Bridgeport 621-NM 3/4 inch Plastic Romex Connector
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The part that secures it to the panel appears sheared off though. You can see the red wire protruding below.
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Could be, that may also explain the angle of the connector.
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There is according to Google… 
Just my 2 cents, no one should be using a search engine or AI to answer questions like this if you want to ensure that you have the correct answer. The Internet is full of wrong information which a search engine can find just as easily as it can find the correct information. Case in point, this thread.
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Google gave specific language from the NEC Book …
I’m going to find it today and and post the actual verbiage from a
NEC Book …
Just so you know I was only joking
Yes I did. 
Thanks Robert. I didn’t think about those and don’t remember any being that large.
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I’ve noticed that you have Westinghouse and Siemens breakers. That alone is reason enough to call an electrician to service the panel correctly. I’m confident that the electrician will discover additional issues with it during the servicing.
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