I have been wet tumbling thousands of brass using steel pins and never noticed any damage to the lip of the neck.
However, I have found that a slightly misadjusted seating die can form a slight ridge on the lip of the neck that could cause a ragged edge when a bullet is seated.
The only time I have seen nicks like that shown in your picture on the lip of my brass is occasionally when an ejected brass pops off the shooting bench and hits the concrete on its lip.
After depriming, I clean & size, then rinse the lube off the brass and dry the brass.
Then I chamfer after I the brass is checked for length to see if any need trimming.
So I think I would see neck damage from wet tumbling when I inspected and checked the length before I chamfer the brass. I haven't found any yet.
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