according to wiktionary [1], this is indeed a possible meaning of the verb "to ignore", but it is marked as "obsolete".

This is a case of false friend when translating from french, where this meaning is the first one [2].

[1] https://en.wiktionary.org/wiki/ignore#Verb

[2] https://fr.wiktionary.org/wiki/ignorer#Verbe

"I ignored..." = I was aware, but consciously chose not to address it, but perhaps softer than, "I consciously chose not to address it. "I ignored the fact that the sun was out, and returned from the beach sunburned." (I knew the sun would burn me, but went out anyways, with perhaps a shade of not realizing how much I would get burned.)

"I was ignorant of..." = I was unaware. "I was ignorant of the fact that the sun causes sunburn, and returned from the beach sunburned." (I didn't realize the sun would burn me.