No, it should be compensated, so Management prioritises fixing issues, instead of adding new bugs

I've wished for a tech workers union for this reason. I don't care about pay, let the union say nothing about pay.

But let's align incentives. Any time spent fixing issues on-call is compensated 4-to-1. Workers may accrue compensation time, and any compensation time in excess of 20 hours is paid 10-to-1 when the employee leaves. The idea here isn't for workers to accrue and cash out comp time, but instead to give an incentive to the organization to ensure workers use their comp time.

Let's align incentives, what's hard on the worker should be hard on the owners and management.