Echoing others - I have completed all the pinnacle cache quests, several delves, plenty of keys, and multiple raid bosses and have not received my half spark this week. I came into the week with the equivalent of 2.5 sparks, and still have 2.5 sparks.
A poster below mentioned something that I also noticed, so highlighting it again here: I noticed that my weekly crest caps did not reset at the same time as the weekly reset. I don’t recall if I ran the pinnacle quests before that cap reset, but I believe I did. Also wondering if that caused the issue?