While having a Pale Blessing active, sometimes the enemies will not detect/attack/react to you, they just stand there and can be killed without them reacting, i have this seen happen when entering a lost sector with a pale blessing active, sometimes this will also happen on overthrow zones randomly when acquiring the blessings from the flowers.
Also, when theres prismatic rifts and you have a blessing, the light/darkness meters won't fill when standing on them.
All of the above fixes itself when the pale blessing buff goes away.
I currently have no video, but i will try to record the issue and add it to this post as a coment.
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Had this happen to me a day ago and thought it very weird, wasn't sure if it was intended or not. Either way, as you said it reverts to "normal" once the blessing times out.