Going to be serious for a sec. Sorry.
I feel like the entire film is horribly put together. There should've been no Losers Club flashbacks. Especially not in the abundance there is. They're just retreads. Worse, they mirror what is happening to the adults. So right there you're doubling the length of sequences for no reasons other then having the kids in it again. And as CGI monstrosities. If you wanted the framing device, then you film the two films like the book. But once part 1 was what it was, you do not walk it back.
The difference in competence between the scripts makes it so clear they were written by different people. The second film has no drive, has so many unnecessary scenes, while undercutting itself time and again. It's just bad. I wish I could laugh, but I wanted them to land it so badly.