"With the advent of the P5 Patch it appears that the Blue Post from 7/24/20 has taken effect and Ignite is now behaving as it did in Vanilla.
This means simply that a crit is required between every tick of ignite after the first tick [..]."
Before this change, each crit reset the duration to the full 4 seconds.
However, after the changes crits need to happen after every tick of the first window, so crits need to happen in the windows of 2-4 seconds, 4-6 seconds, 6-8 seconds, 8-10 seconds, 10-12 seconds and so on.
Hope this helps you with reworking the library to properly track the duration of Ignite again.
"With the advent of the P5 Patch it appears that the Blue Post from 7/24/20 has taken effect and Ignite is now behaving as it did in Vanilla.
This means simply that a crit is required between every tick of ignite after the first tick [..]."
Before this change, each crit reset the duration to the full 4 seconds.
However, after the changes crits need to happen after every tick of the first window, so crits need to happen in the windows of 2-4 seconds, 4-6 seconds, 6-8 seconds, 8-10 seconds, 10-12 seconds and so on.
Hope this helps you with reworking the library to properly track the duration of Ignite again.