Defiled Forces passive node not extending rider effects of ignites

When you use Defiled Forces to extend the duration of an ignite, effects like the -10% to fire resistance from Combustion Support do not appear to persist past the original duration of the ignite.

I noticed this when I used Flammability on a fire-resistant mob, who remained fire-resistant with just the curse applied. Once Fireball applied Ignite (and the -10% resist along with it), the enemy changed to being weak to fire, showing that Combustion reduced its resistances.

However, if I only use Flammability to sustain the ignite, the mob's resistances will switch back over to being fire-resistant, suggesting that the -10% resist from Combustion is no longer being applied, despite the same ignite that inflicted it still existing on the mob.

I can't tell if this affects other riders, but it feels like this might also affect Proliferation.