The Squire strange interaction with triggered skills

I was trying to play a trigger build so I tested the concept with how many trigger I can achieve with one attack, and I found a weird bug when you socket a trigger support in the second slot of the Squire.

I have 6 triggers that should trigger in 1 attack

1. Fiery Impact
2. Fire Burst
3. Fissure
4. Call the Pyre
5. Void Shockwave
6. Prismatic Burst

However, when I socketed all of them in the mace + the Squire, a trigger support that socketed in the second slot of the Squire will not work.

https://youtu.be/vRbHup6mflQ

In the video I swapped three trigger support gems, and the one I socketed in the second slot of the Squire will stop working.

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Then I tested further and found another, even weirder bug.

Pyre Support will trigger Call the Pyre on melee hit against ignited enemies, but if I socketed Fissure on the second slot of the Squire (which will make it not work, as I said above) a melee slam will trigger Call the Pyre instead of Fissure, even when the skill wasn't hitting ignited enemies, or hitting any enemies at all.

https://youtu.be/lU5rholeBVA

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At first I thought this weird bug was because there are hidden limit of how many trigger one attack can do, but then I tried socket all the skills in body armour instead (Volcanic Fissure of Snaking - Fissure - CDR - Pyre - Shockwave - Prismatic) and when I attack with VFoS, all 6 trigger supports trigger normally (both Fiery Impact and Fire Burst are trigger on hit), so I think it's not a trigger problem but rather the Squire bug.

Also, this second slot Squire bug will not happen if there is only 1 trigger support, for example, only socket VFoS in the mace and Fissure on the second slot of the Squire without any other trigger support will still make Fissure funcion normally.