I have Lolopanther Plate since R7 as well but I always used Plate with it. I always saw it as a armor set that negates its weakness.
But let’s try to align things and see if we can get enough info for a bug report (or to understand what happens).
This is the info I have:
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Is the damage sure reduced by a % range instead of flat? Yes.
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Can the reduction be more than 25% Strike bonus? Not sure.
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If 2=Yes: Is the reduction only applied when you have other type of bonuses or reduced even when no other bonus is applied? Not sure.
(As in: Does it negate Cassis Crita+Strike bonus only or does it reduce damage even when you’re not wearing Cassis Crita - as if it reduced bonus to -%?)
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If the target wears Leather or Cloth does the damage gets reduced? Yes (from what you said).
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Do the same happen if you use Pierce-type attacks against someone wearing gears with Pierce-type defense? No (from what you said).
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If 5=No: How does reduction from Pierce-type attacks on Pierce-type defense works? Not sure. (Added to defense before formula like Memester said or flat total damage reduction?)
So if it’s only Strike that has the behavior - yeah, it’s a bug. (And probably not the other way around since like Di3rn said the damage is reduced a lot.)
If you have no other % bonus damage (not even Cassis Crita or bonus that are related to your own skills) and the damage still gets reduced that’s a probably even worse bug (too op with 4 primus gears summing over 800+ strike defense).
If it only reduces the bonus damage via formula (by being reduced on the bonus damage part) the it’s probably decent behavior, yet old or wrongly placed mechanic.
I hope this clarify/unify the information we have and serve as a guide if someone wants to write a proper bug report to avoid ambiguous information (try to avoid passing the impression you’re mixing sets, try to make the conditions clear to what happens and what does not happens :x).
Sorry, my experience was always with Strike defense on the defensive side and always using entire sets (so Lolo Plate Pants+Armor in the past).
The test I did might not be a proper one since it’s mostly noticeable on higher p atk. My bad on that one too.