I:R - Potter to King achievement not registering my ownership of Syracuse

[RukRukRuk]

Description of problem
Potter to King achievement not registering my ownership of Syracuse

What platform are you playing on?
Steam

What game version are you running?
1.4.1

Please select any/all DLC you have enabled.
Hellenistic world flavor pack,
Magna Graecia Content Pack

Do you have mods enabled? No

Please explain your issue is in as much detail as possible.
Every settlement in Sicily is either directly owned by myself or my feudatories, Agathokles is still alive (but not well, he has dementia), but the achievement is not being awarded. The achievement doesn't seem to recognize my ownership of the area of Syracuse for some reason.

I have even completed the "Secure Sicilia" mission in the "Leadership of the Siceliotes" mission tree, which is only possible if you control Syracuse.

At first I thought I wasn't getting the achievement because Gelas was a feudatory, but even after integrating them and waiting a month it did not happen. Also tried exiting and restarting the game. Save file is attached.

Steps to reproduce the issue.
Use Leadership of the Siceliotes mission tree to get feudatories, then conquer everything you couldn't get diplomatically.

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[CidRed]

There is a small island to the south (Malta nowdays). You need to annex it.

 

[GAGA Extrem]

It does indeed look like you are missing that final territory.

Please check if the issue persists after you have conquered liberated Malta.

 

[RukRukRuk]

Oh wow that's embarrassing! Consider this issue resolved.