Regarding glitched/bugged gigs not completing, I think I've found a temporary solution. And I say temporary as I hope CDPR patches this ASAP:
Wait to have at least two gigs in an area/district.
Go to GIG A and manual save, then complete it like normal.
1) If Regina calls and says job done, go to GIG B and manual save, then complete it like normal. Upon completing it, it'll most likely glitch out and you'll have to do 2 below:
2) If Regina calls and says she has a job for you, i.e. the same job you just completed, load the save and head to GIG B first, manual save and complete it like normal.
Chances are you'll be doing option 2 more than option 1.
After you complete GIG B, Regina will most likely call and say she has a job for you (GIG A) which keeps GIG A open while simultaneously completing GIG B.
Head to GIG A, manual save, then complete it like normal.
This SHOULD complete both gigs. At least it has been for me until CDPR patches it.