עַל־זֹ֛את חִגְר֥וּ שַׂקִּ֖ים סִפְד֣וּ וְהֵילִ֑ילוּ כִּ֥י לֹא־שָׁ֛ב חֲר֥וֹן אַף־יְהֹוָ֖ה מִמֶּֽנּוּ׃ (פ)
איבער דעם גורט אָן זאַקקלײדער, טוט קלאָגן און יאָמערן; װאָרום ניט אָפּגעקערט האָט זיך גאָטס גרימצאָרן פֿון אונדז.
Rashi
Because of this What is “this?” “For the fierce anger etc.” Although he spoke above concerning Nebuchadnezzar in regards to the destruction, here he returns to speak of the death of Josiah.
Rashi
for the fierce anger of the Lord etc. Although Josiah repented wholeheartedly, it is stated concerning him. (II Kings 23:26)... “the Lord did not turn back from his great wrath...because of all the provocations that Manasseh had provoked Him.”