5-month-old GSD eating mud and wood aggressively, even broke his muzzle – advice needed

Hey everyone, I’m seeking some advice regarding my 5-month-old German Shepherd, Draxo. He’s been displaying some really concerning behavior lately – he’s constantly trying to eat mud and wooden sticks. It’s not just casual chewing either – he gets super aggressive about it, to the point where he recently broke his muzzle while trying to get to mud. We recently dewormed him using Bandystar syrup (2 ml for 2 days, as per the vet’s advice), but this behavior hasn’t stopped. He seems almost obsessed with trying to eat mud and wood, and I’m worried it might either be a nutrient deficiency or some deeper behavioral issue. Has anyone else experienced something like this with their pup? Any tips on how to correct this behavior or understand what’s causing it would be really appreciated.