The season pass continues to blink even though all rewards have been obtained. This is clearly a bug that needs addressing. With so many other glitches in the game we have little hope this will be resolved soon.
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If you have any resources that can't pick up (golf balls, orange golf balls, glimmer, etc) it will keep blinking. This is across your three characters/classes. As for vendors they blink if you have any engrams from them to use, unless it's zero blink blink blink. Also the same if you have any of those resources you can't pick up.