Reflected elemental damage reduction bug - added video with problem

I am playing lightning strike build and i am not refelcted ele damage immune. Using 3 scarabs of risks so sometimes mod gets added to map mods (i am running basically all the time t17s).

I am solving refected ele damage with changing elemental mastery to 60% reduced reflected elemental damage taken plus taking another 50% reduction of reflected damage on pantheon from yugul.

If i do it before i start the map - to be able to run map which has that mod on it already, all is fine. But if i get surprised by mod from it being added from scarabs of risk and i change my pantheon and elemental mastery after i already started a map it doesn't work. It works for a bit, but then suddenly some damage i do gets reflected anyway. It doesn't take long for it to happen. I kill few monsters, all seems fine and suddenly i just delete myself from reflected ele damage. Happened to me many times before, now i got upset enough to report it. xD Should not be difficult to replicate imo.

EDIT: I recorded video where this si happening. First map started before i changed setup, second map started after i changed setup. First map problem happening, second has no problem at all. This is exactly what happened to me bunch of times before.

https://youtu.be/c0XrZgP-IGY

I am ailments immuned thx to purity of elements. And nope. As i said, it is happening only when i swap setup in already started map. If use same setup before i start the map it works as expected = i am reflected ele damage immune. Fully. In already started map i am not with exactly same setup (i am for a while then i am suddenly not). So it is definitely bug.

With 50% reduced ele damage taken from pantheon plus 60% reduced ele damage from elemental mastery on passive tree i should have 110% reduced ele damage taken = complete immunity. Right now i had on map added mod from scarab of risk - monsters reflect 18% of elemental damage. I died one time and changed to ele immunity setup in hideout. Killed few monster and again deleted myself. 5 times till i run out of portals. This is not first time - happened to me more times before and only when i swap to my reflected ele damage "immunity" after i start the map. If i do it before i start the map it works 100% without problems.

And btw, why should shock even lower your reductions to reflected damage? It just increases damage taken, right?

EDIT: just now happened exactly the same and i recorded it. I will upload video to YT and post it. It is very clear what is happening.

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seaman#4993 wrote:

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BadAssTom#2893 wrote:

And btw, why should shock even lower your reductions to reflected damage? It just increases damage taken, right?

Increased damage taken from shock is additive with reduced reflected damage taken. For example, with 30% shock
60(mastery)+50(pantheon)-30(shock)=80% reduced reflected damage taken.

I think this is pure nonsense. Why shock should be additive with reflected damage reduction? With any damage reduction? I just did quick search and did not find anything suggesting that shock is lowering anything at all. If you reduce something by 100% it means it dissapears. In this case reflected damage. If you increase damage which is coming to you 1000 times and then reduce all incoming damage by 100% you will still take no damage. Shock incrases damage taken, but doesn't reduce your stats imo - in my case one of those stats is that i take 100% reduced reflected ele damage.

But as i said i am ailments immune anyway so even if you were right shock doesn't apply to me.

And let's not fill up thread with pointless debates. My only intention here is to report bug to devs. Thx for suggestion though.

I edited initial post and added video link to problem happening real time. Exactly this way it is behaving every time i encountered it. When reduction to reflected ele damage are set up in already started map it don't work. When same setup is put in place before map is started, it works flawlessly.

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seaman#4993 wrote:

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BadAssTom#2893 wrote:

If you reduce something by 100% it means it dissapears.

What you are talking about would be called 100% less damage taken. But the modifiers increased and reduced in PoE are additive.
Mastery and Pantheon - reduced reflected damage taken.
Shock - increased damage taken.

In the video you have the debuff Marked for Death - You are taking 50% increased Damage. This is also additive with your reduced reflected damage taken. (60+50-50=60% reduced ele reflected damage taken).

Fking hell you are probably right. I just rolled map from scratch to have marked for death and ele reflect on it and was already set up for reflection before i started map and ws dying from reflected damage. Ok at least i know why. I keep an eye on it for future if find something suspicious again, but for now i belive that is is like you said.

Description of stuff in poe is definitely lacking.

Thx for info and explanation.