Is Ezekiel 29 a failed prophecy?

> Ezekiel 29:13-15 KJV Yet thus saith the Lord God ; At the end of forty years will I gather the Egyptians from the people whither they were scattered: And I will bring again the captivity of Egypt, and will cause them to return into the land of Pathros, into the land of their habitation; and they shall be there a base kingdom. It shall be the basest of the kingdoms; neither shall it exalt itself any more above the nations: for I will diminish them, that they shall no more rule over the nations. Above are verses from Ezekiel 29. He’s prophesying the destruction and desolation of Egypt apparently by Nebuchadnezzar 2nd. In the prophecy Ezekiel states that the Egyptians will be carried away and the land will be desolate for forty years. After this period they’ll return but will be henceforth a lowly kingdom. I can be convinced of the forty year captivity period to a point. Nebuchadnezzar was known to carry away and enslave citizens of places he’d conquered. And the period between his unsuccessful invasion of Egypt and Cyrus the Great’s edict to release those of whom had been enslaved by the Babylonians was roughly 40 years. However, what seems obviously wrong about this prophecy is the aftermath of the 40 years and return of the Egyptian captives: the kingdom of Egypt forever becoming a “base kingdom”. Egypt as a “kingdom” was never a lowly kingdom afterwards and it did rule over other nations, particularly the Ptolemaic Empire. One might say “This prophecy concerns the Egyptian people, whereas the Ptolemaic Empire was *Greek*.” However Ezekiel says Egypt will become a lowly **kingdom** not ‘nation’ or ‘people’, clearly meaning, I presume, the country. It seems to me that this part of the prophecy completely fails. Others then might suggest that this whole prophecy is one yet to be fulfilled but I personally see no indication of that in the text. With the frequent mentioning of Nebuchadnezzar it seems clear to me personally that chapter 29 refers to his unsuccessful invasion of Egypt. Can anyone who is familiar with this prophecy shed some more light on it. I’m assuming there is something I have missed.