Hi there,
I have beaten maybe 7 or 8 times Venom in the mission Resue Mary Jane (last mission in the Venom part of the prologue). Each time I got the ****y 20 ISO reward. I’m curently at 1/4 and I’m almost sure now there is a bug in this mission reward.
Anyone else experiencing the same ? Devs, can you take a look at this please ?
Thanks in advance.
I’m pretty sure it’s working as intended. Some missions just don’t like to give their rewards out. 
Take a break and play it at some other time.
Yeah, it’s common experience that missions tend to give 20 when played in succession but if you try it next day yo get something.
You must be rignt, yesterday was not my day, that’s all. I finished this mission thrice today and got all the other rewards.
Still, the reward mechanic is something strange in this game and sometimes very irritating !
Thanks for your replies 
7 to 8 times?
I’ve played one mission about 20 times and got the 20ISO every time. Eventually rage quit it and came back after a week.
Got the other 3 rewards in 3 attempts -.-