I heard that when a non-living object does an action (verbs), it always uses the「が」particle, and when I searched for examples, it seems correct, since「は」always seems to be used as contrastive. However, after I learned about the Exhaustive and Neutral「が」, I don't know why the Neutral one is used here if it's not the Exhaustive:
車が壊れた。 タイヤがパンクした。
I also learned that intransitive verbs always use「が」(Or contrastive は) as well, so, how is it related to neutral「が」?