Black Diamond did a bit of testing on sharp edged biners and ropes.
First bolts, crux bolts, and out of line bolts see the most wear. The biners on these bolts need to be checked often. To avoid these situations stand close to the wall when belaying, especially when lowering. Use your own first draw on the first bolt of fixed routes. Use long slings to reduce rope drag. Use steel biners on popular routes. Never assume that fixed gear is in solid working condition.
Touchstone gyms routinely make safety inspections to safeguard against these possibilities. If you see a worn biner or draw please notify the front desk.