Realm Crashes and rolls back world, when using Nether Portals

I have it where when players use Nether portals, it can randomly crash the Realm, and cause a rollback to the last seemingly saved state.

This is happening more and more often, specifically every time with the player "Jaquapie" on the realm.

I have tried the following:

• Checked that my network connection is enabled, and that no programs are blocking outgoing connections.
• Checked to make sure my wifi connection was stable
• Restarted both modem/router on both ends.
• Checked that the router was set to use open NAT
• Tried disabling any existing firewall program, or changing its configuration options.
• Tried downloading a local copy of the world and then uploading it again with the replace option
• Tried connecting directly to the network using an Ethernet cable
• Tried closing the Realm and re-opening it again
• Tried reverting to a previous save of your world through your Realm's settings
• Tried connecting from a different network to see if that works
• Tried restarting the devices.
• Tried different devices.
• Tried different player skins.
• Tried different times of the day.
• Tried different portals.
• Tried breaking and remaking portals.
• Tried downloading, and re-uploading the world.
• Tried switching the game mode, and switching it back to survival.
• Tried different difficulties.

Still have this issue.