I:R - Characters keep holdings in territories becoming uncolonized by losing the last pop

[Herennius]

Description of problem
Migrating can leave uncolonized territories with holdings owned by characters

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.
Title - I stumbled randomly about this issue in AI territories, after Burgund migrated from Skandinavia to Eastern Europe. I was able to create a save from shortly before Burgund leaves on of their territories (Bergio), which has an holding owned by a character at that Point.

Steps to reproduce the issue.
1. Load save
2. Investigate the Burgundian territory of Bergio and see that the holding there is held by the character Acthram Merobaudes
3. Let the game run until Burgund gives said territory up (happens in my runs in Oct 467)
4. Investigate the now uncolonized territory again and see that the holding there is still owned by A.M.

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[Herennius]

This occurs still in 1.5.2 and allows characters to draw powerbase from holdings you can't revoke (at least not before recolonizing the territory they are in):

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In case you need to reproduce this with a situation before the territories gets deserted while someone having the holding in that moment, you can use the attached save:

1. One of my Clan Chiefs has a holding in Pintien and the territory only has one slave pop
2. Move that slav pop to the territory of Clunien
3. Pintien is now uncontrolled, but my Clan Chief still owns the territory
(4. You might continue til a new month starts, but it will not change anything)