Potion Core extension-regen bug

[nimuck]

*This is actually a bug with just potioncore and it's not an interaction issue, but since I can't reach the potioncore creator I'm posting it here anyway

Description
If amplifier of extension is greater or equal to # of potion effect - 1 (so it's 'fixing' all other durations - this is intended behavior), and if amplifier of regen is less than 6, regen takes no effect at all.
Other potion effects seem to be fine
(very werid :S)

Reproducibility
Only potioncore is needed, and it's definitely consistent; although I don't think we'll see much of this in survival

[nimuck]

And the same thing happens with healing potions in betweenlands

[cdstk]

Just some extra info,

There are various effects that rely on the duration ticking down in order to perform their effects. In this case, Regeneration relies on the duration ticking down on certain cycles with higher amplifiers changing the tick range.

That is why Regen 5 and Regen 6 may do healing or not, they are checking for different duration ticks. Regen 6+ can do healing every tick thus it doesn't matter what duration tick it is frozen on.

[nimuck]

Yeah that's what I observed exactly
It's interseting that the vanilla code treats regen 5 and regen 6 differently
maybe they did so for the optmization purpose?