At our work the test environment may not be an exact copy, given it has the intended changes, but pre-prod is (until updated).
One observation on FDev is that over the years they have had numerous instances of fixed bugs popping up again, while it's a guess, it feels very much like their source control practices are poor, and sometimes someone has done a bad merge / cocked up a build, and there's no regression testing to catch things.
The external observation of their devops practices seems poor.
One of the mods I think said recently something like "they only work 7 hours in the UK", which is true, but if we'd screwed up a live release you can be damn sure people would be pulling overtime until its fixed.
Or if serious enough, it'd be a rollback: and IME the recent update (given the impact on the majority of live users) would have been pulled until the bugs were fixed, and then pushed out again. We'd never get away with "it can wait over the weekend until Monday", but then our firm is commercial and not a game dev, so <shrug> yay for more relaxed business practices I guess :/
Anyway, lets see if the latest 500MB patch fixes things.