So as usual, "we can't find people" is code for "we tried to exploit the workers until they bled and for some reason we can't figure out, they went elsewhere."
Bingo. "No one wants to work [for a wage they can't live off of with pitiful benefits] anymore!"
Since COVID happened until this year I would have told you "we can't find people" too, but this year the applications have flooded in. So at least they'll come crawling back eventually.
It's an incredibly dangerous job, both in terms of chronic health and acute risk.