I've seen posts on Twitter where the problem is just that. Farmers (in the U.K.) getting municipal compost only to find it full of shredded plastic.
And they were the ones who gave a damn to post about it. There's also the one's who just don't care and go ahead and landspread this for the benefit of cheap fertilizer.
Closer to home I myself ordered a load of woodchip for animal bedding off an add on an online site. The seller persuaded me to get a load of "recycled" woodchip on the phone. They turned up in the dark with their load and tipped up. The next morning on inspection it was full of chopped plastic, glass and plastic covered wire as well as chipboard, plywood chopped up.
Well I wasn't having this rubbish being used for animal bedding and then landspread after. Cheque was cancelled and phone call made and they had to pick it back up. The sad thing is he remarked that it was quite popular for bedding livestock. I couldn't believe how people could be so stupid and careless to ruin their soil that they themselves could be eating from. What chance have future generations got with these imbeciles about..
Even these so called biodegradable plastics contain PFAS which harm your health and your animals health when they enter the soil and into the foodweb.