5. The premillennial problem of a judgment after the final definitive judgment.
In 15:1, John states that with the seven plagues or bowl judgments the wrath of God is finished. In 16:12-16, the sixth bowl judgment concludes with the nations gathered at Armageddon, following which the seventh bowl judgment represents the end of history. It is clear that 18:17-21 picks up the narrative where 16:16 leaves off and concludes it. This means that 19:17-21 covers the same timeframe as the sixth and seventh bowl judgments, thus bringing to a definitive end the wrath of God against unbelievers. How then could there be a further, much later judgment related in 20:7-10? Thus, 20:7-10 is likely referring to the same final judgment narrated in the last bowl (16:17-21) and in 19:17-21. If this is so, then 20:1-6 precedes the final judgment at Christ’s final second coming.
-G. K. Beale with David Campbell, Revelation: A Shorter Commentary, 444-445.