Burning inscription support sometimes doesn't create burning ground

Using burning inscription on temporal chains curse sometimes result in no burning ground created. It seems totally random, but noticed happening it more often when used when the rare monster or boss stands in the middle of the curse cast.

Temporal chains setup: burning inscription - expanse - ritualistic curse

I am also noticing this bug but on my Flammability curse.

Gem Setup:
Flammability - Burning Inscription - Inspiration - Focused Curse

I have just noticed that swapping weapons appears to cause this "bug" to happen, even if the curse and burning inscription can be cast with both weapons.

Not sure if that is intended or if it is happening outside of that specific scenario.

Gem setup:
Conductivity - Burning Inscription - Focused Curse - Spell Cascade - Expanse

I noticed that expanse is causing the burning ground to be even less likely to happen, the center rune NEVER burns the ground and the two outer runes only burn if they are not touching walls/interactables.

If I remove expanse the center always burns but the issue with walls/interactables persists.

It seems to be caused by the lack of animation for the actual 'runic inscription' when casting the curse. If you get the 'Curse Application Delay' down to 0 so that it isn't even a stat on the skill sheet anymore.

I have a weapon swap setup for conductivity with all the activation delay speed passives to a point where you don't even see the animation on the floor. Since there is no actual runic inscription appearing on the floor the Burning Inscription doesn't trigger.

If I switch back to casting it without the activation delay bonuses (back on weapon set 1 then the burning ground appears after the animation finishes).

Gem Setup: Conductivity - Heightened Curse - Focused Curse - Hex Bloom - Burning Inscription

Confirmed this by swapping gems out to increase delay again swapping Focused Curse for Ritualistic Curse puts the 'Curse Application Delay' back to 0.6s and the rune briefly appears and then the burning ground appears after even on the weapon swap.


Additional Bug:
To note however the burning ground is only the size of the default curse not the whole cursed area. If you have increased area of affect then the burning ground should be the size the whole curse covers no?