False "Incompatible FML Modded Server" error

OS Name/Version: Ubuntu 24.04.3 LTS on an Oracle VM

Product Name/Version: Phobos 2.6.0

Problem Description:

Currently running the Concatenation mod pack on version 1.1.2 and when in the server list i see a big red X and an error that reads:

“Incompatible FML Modded Server, Server mod list not compatible”

This type of error would normally prevent me from joining the server but in this case i can simply join and play no problem. The issue is that this is deterring players as they believe there is a server problem and choose not to play.

Steps to reproduce:

  • Install and run Concatenation modpack version 1.1.2
  • See error
  • Join server just fine
  • ???

Actions taken to resolve so far:
I have attempted to modify various server settings and searched around these and other forums for answers to no avail.

edit: visual clarity

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