The gemara in חולין on 6b / 7a (apologies, on mobile so can't provide link) discusses how the copper snake of Moshe should have been destroyed by earlier Kings (specifically referring to those kings who were righteous and aware of the issue), as it was being used for avodah zarah, but it was left to חזקיה as מקום הניחו אבותיו להתגדר בו. If there was a genuine avodah zara issue going on, how could it be intentionally left for חזקיה to fix? If there wasn't an issue, in what sense have the earlier Kings left a place להתגדר?
I am assuming that מקום הניחו לו means that it was intentionally left for later generations, based on Rashi Chullin 7a -
מקום הניחו - כשיבאו בנינו אחרינו אם לא ימצאו מה לתקן במה יגדל שמם When our children come after us, if they don't find anything to fix, how will their name become great?