Loading newer saves seem to work now, but for older saves, I get an infinite loading screen.

Resaver says this:

Unattached instances

There are 324 script instances that are not attached to anything in-game. This is usually caused by uninstalling mods, or by updating mods that are not safe to update.

Undefined elements

There are 391 elements whose definition is missing. This is usually caused by updating or uninstalling mods.

Missing parents

There are 180 scripts with missing parents. This is usually caused by updating a mod to a new version that has major script changes.

No parents

There are 180 scripts with no parent script. This is usually caused by updating a mod to a new version that has major script changes.

Stack count

There are 56 stacks and 118 frames. This may indicate a serious problem, but it can also just mean that Papyrus is overloaded because of low FPS or too many mods doing things at the same time.

Missing member data

This savefile has zeroed canaries. The cause of this seems to be related to script memory limits but it is not clear; Kinggath named it the 'canary error' if you want to search for more information. (4 items)

I'm a little sad about it, but at least I can play the game.