Focus nodes are literally broken and they have been for 4 years now

I am trying to use Energy battery to stack damage with Culvinars claim and the damage actually decreases!? Once Culvinars claim eats my mana the blast from Energy battery drops in damage and no longer gets more powerful from me gaining mana.

Not been tested thoroughly but in general the damage of the Energy battery blast is usually about 3-4 times stronger if I let go at the one second mana burst mark. Unsure if this is a bug or the ability does not work the way it is listed. Another possibility is that the Energy battery only refers to the mana gained from the 1 second burst but even then the damage should not drop by holding it for longer.

Any ideas or a more comprehensive breakdown of the ability? I have been having a large amount of trouble finding more information.

Edit: After testing this more I have also found it has a tendency to not work at all! Once and a while I have no lightning wave trigger. At first I thought this was due to mana costs and I tested it by only using mana above 100 (Which is more then enough for the lightning wave) and throughout testing I could not get the damage to be higher or to have the ability consistently work. I see a lot of forums from earlier years about this happening and I am confused as there was never a fix stated. Found one here: Mage - Focus skill - Energy Battery not working

Reports about the bug are about 4 years old.

After testing I can confirm that this bug also stops Mind’s Shield from working and makes it behave weird. Instead of waiting for me to finish channeling it give me the boost a little after the 1 second boost from focus? Something is really wrong with these nodes.

They added a whole New Unique for this ability and yet never noticed that the main synergies for the unique are completely broken!!? I could understand if this was something that is new and they never got a report about but there have been reports about the bug for 4 years and they either somehow never noticed or didn’t care. Was really looking forward to a build with this but the character is probably just going to be scrapped now and I drop the game until the next update.