Can’t clone site if too many users

We use NS Cloner to clone sites within our multisite setup. I had imported 24,000 users and everything seemed fine until I tried to clone a site. It will not copy unless I turn off the Multisite User Sync plugin.

After I cloned a site, I tried to turn the plugin on and I got an error message: Plugin could not be activated because it triggered a fatal error.

The developer at NS Cloner said: “that large of a number [of users] could well result in memory issues if the user syncing plugin is trying to perform some update on all of them. That would really be a question for the developers of that plugin.”

Has anyone had success with this plugin, cloning subsites of a multisite setup, and a large number (@ 24,000) of users? If so, what cloning plugin do you use?

I’m on the latest version of WP: 5.5.1

Thanks!