Agree. That's a LOT of fiber. As I was commenting to another poster earlier this evening, there isn't much research of how much is "too much", but most commercial feeds for chickens have fiber from maybe 3% at the low end to 6% at the high. Your 12% livestock feed is 3.5 to 7x that. and unlike humans needing to be more "regular", extra fiber doesn't benefit a chicken as it does us.I second what @U_Stormcrow said.
Use it as a treat...a tiny amount every now and then.
Scratch/treat, not every day. Small quantities.