I'm half joking here but at one of my past workplaces, the development process was something along: fix bug, get reviewed, pull request tested by QA, integrate,

I'm half joking here but at one of my past workplaces, the development process was something along: fix bug, get reviewed, pull request tested by QA, integrate, retest after integration, run in UAT and only then eventually deploy to production. Anything coming up at any of these phases would throw it back to development ("fix bug" phase) so we were joking that if we get a P0 critical priority bug on Monday morning and aren't done fixing it by afternoon then there's no chance in hell it will make it to the deploy on Friday :)