Can't continue Eureka Orthos Save due to Friend Disconnecting

Date & Time: 30th of May, 1:45 AM
Frequency: Once
World name: Odin
Character name: Arodaeus Cen'viatorem
Class/Level: 100
Party or solo: Party
Area and coordinates: Eureka Orthos Instance

Steps:
1. Friend disconnects while in Eureka Orthos
2. Me and another party member complete 10 floors while other friend is disconnected
3. 2 people now have floor 90 saves but disconnected friend has floor 80 on theirs
4. Cannot enter the save file with previous party makeup

Connection Specs
- Type of internet connection/provider: Wired internet/Ethernet
- Modem maker/model number: Hyperoptic Modem model: EX3301-TO

I am wondering if anything can be done about this? Should our friend's save be stuck on floor 80, is this a bug? Thank you for your time.