Endgame map mechanic bugs

Some bugs I have discovered mapping so far.

Sometimes the last rare killed in a map fails to drop a waystone of equal tier.
Sometimes the boss fails to drop a waystone of a higher tier (no waystone drop at all).
The rogue exile atlas nodes are either bugged or non functional (done 30 maps with all rogue exile chance nodes specced have not seen a single rogue exile could also be terrible rates).
Some strongbox mods/nodes are bugged or non functional (had a "contains additional unique item" mod on a strongbox yet opening it did not drop a unique item could be more mods that are non functional).