Nevertheless, the people still sacrificed at the high places, but only to the LORD their God.
We have seen Manasseh by his wickedness undoing the good that his father had done; here we have him by repentance undoing the evil that he himself had done. It is strange that this was not so much as mentioned in the book of Kings, nor does any thing appear there to the contrary but that he persisted and perished in his son.
Commenting on 2 Chronicles 33:11-20
Now the rest of the acts of Manasseh,.... Good and bad, what were done by him both before and after his conversion: and his prayer unto his God; which it seems was taken and recorded, but now lost; for as for that which is among the apocryphal writings, there is no reason to believe it to be his, though it is thought to be so...
the people did sacrifice still in the high places, yet unto the Lord their God only--Here it appears that the worship on high places, though it originated in a great measure from the practice of heathenism, and too often led to it, did not necessarily imply idolatry.