Fury Valve Unique Amulet when paired with Locus Mine Support resulting in fewer Projectile Splits

This is easily reproduced

Fury Valve, Modifiers to Number of Projectiles instead apply to the number of Splits (This ignores the base 1 projectile)

If you get 10 Additional projectiles (In my test case, +2 Endless Munitions, +1 Wand Mastery, +1 Multishot Passive, +4 GMP, +2 Fury Valve) with fury valve it will split towards 10 additional targets. This is correct and working as intended.

If you now socket Locus Mine Support which has the effect "30% Less Projectiles" it should result in 7 Splits (10*0.7=7), However it is resulting in 6 Splits. (This is represented in the skill's tool tip as well as being visually reproducible)

This is inconsistent with other projectile counts. If you now add a LMP Support on top of the previous example resulting in 12 Additional Projectiles and socket in Locus Mine Support this should result in 8 Splits (12*0.7=8.4), And in this case it does result in the correct number of splits and is working as intended.

In my personal use case of 6 Additional projectiles the resulting splits should amount to 4 (6*0.7=4.2), However it is resulting in 3. If I remove a projectile to 5 (5*0.7=3.5) the resulting splits remain 3. If I instead add a Projectile to 7 (7*0.7=4.9), The resulting splits are also correct at 4.

If I have a misunderstanding of how the Less Projectiles are calculated please correct me but I do believe this is a bug. Path of Building also follows the same calculations and resulting split counts as my method.

Power Siphon + Locus Mines + Fury Valve also appears to have an irregular number of splits:

+2 proj - 1 split
+3 proj - 1 split (3x0.7=2.1?)
+4 proj - 2 split
+5 proj - 3 split
+6 proj - 3 split (6x0.7=4.2?)
+7 proj - 4 split
+8 proj - 5 split
+9 proj - 6 split

Fundamentally, the modifier from Locus Mines appears to be causing a bug in the proj to split behaviour.

I don't use Locus Mine Support, but looking at the gem descriptions and the math I wonder if you are simply failing to account for the effect of Locus Mine Support on the default first projectile. This presumes that all projectiles are counted together and not separately for the first and additional projectiles.

The support indicates that you simply fire 30% less projectiles, which would seem to include the base (first) projectile. It includes the stipulation that it always fires at least one projectile to avoid this 0.7 base projectile from being rounded down.

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oRezurrecT wrote:

If you get 10 Additional projectiles (In my test case, +2 Endless Munitions, +1 Wand Mastery, +1 Multishot Passive, +4 GMP, +2 Fury Valve) with fury valve it will split towards 10 additional targets. This is correct and working as intended.

If you now socket Locus Mine Support which has the effect "30% Less Projectiles" it should result in 7 Splits (10*0.7=7), However it is resulting in 6 Splits. (This is represented in the skill's tool tip as well as being visually reproducible)

If you count this first projectile and apply the 30% less, the math seems to agree with your results:

Total Proj - Additional Proj Count - Resulting Projectiles c Locus

1 ( +0) = 0.7 --> 1
5 ( +4) = 3.5 --> 3
6 ( +5) = 4.2 --> 4
7 ( +6) = 4.9 --> 4
11 (+10) = 7.7 --> 7
12 (+11) = 8.4 --> 8
13 (+12) = 9.1 --> 9

Fury Valve only splits the extra projectiles, so the total splits would be one less than the projectile counts shown above. This appears to match your results? Apologies if I am missing anything.