I have never had a problem with them digging back in in my experience.I could show you several jobs that I have done that way some 3 or 4 years ago and no problems yet.
It could be I just see the ones that don't work and that you have a good way of doing it . I've never tried it . My moms married to this hillbilly and there always eating ground hogs . It's not like there starving there both retired auto works . They say it's just like roost beef . Want some . No thanks mom . One thing if a hillbilly comes to visit and you wish to have them come visit again . Make sure you offer food as soon as they come in the door . They will mostly say no thank you . My mom would always have this table of food ready when family came and they never eat it . Maybe she didn't cook like they liked it cooked . I like it . Them ground hogs sure make some great bait . I like to use it fresh