I loaded into solo explorer ghosts of the deep and while it said it was active, my abilities were most definitely not charging any faster than normal. https://www.reddit.com/r/destiny2/comments/1lrox0y/daybreak_not_working/
These folks are also talking about it.
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Hi there, Thank you for reaching out. We understand the Daybreak modifier does not appear to be working as intended. We're sorry to hear of this, as we can imagine how this may have impacted your experience. If you're still experiencing this, then please consider recording a videoclip which demonstrates what you describe. If you record a video, you can upload it to a site like Youtube, and share a link to it here. We'll then investigate.