More than once here on this end..and in so many different ways....
Soldering.....and then there is the pulling of wire on a job site.... nothing like making a hard wire pull, and popping out 2 ceiling tiles..... pulling the wire to that place..... then completing the second part of the pull from the 2 tiles out location..... only to discover as I am placing all the tiles along the hallway back into the grid, that I accidentally "looped under" the ceiling grid itself and the wire has to come back out to that point....
In the case you mentioned..... black electrical tape would be a choice and an option.