Much of this reflects the chip shortage that Toyota is facing, and how difficult new Corollas are to actually come by. The typical wait time for a Corolla is now 1 year+ in major urban centers of Canada.
As a result you have production lines that were reasonably well suited for demand pre-covid, now having to deal with everyone stocking up on way more parts than they need because they don't want to deal with shortages again.
Toyota could have done that a long time ago (they know a thing or two about supply chain, don't they?) but they prefer to keep the shortage as an excuse for their poor sales performance.