When a user goes into a folder with (say) a dozen movies, the thumbnail for some movie that happens to be generated first is used for other movies.

Not sure the order, but some file starting with R got their thumbnail done before one starting with A. The file starting with A has no thumbnail, then .. it surprisingly gets the thumbnail of the file starting with R, which is obviously the wrong thumbnail.

This is not a huge issue, as it appears that the algorithm used here is self-stabilizing, but I'm filing this to

1. verify that it's self stabilizing and the right thumbnail ends up in the right movie. is it? yes or no?
2. is it easy to correct this temporary bad assignment of the wrong thumbnail?