[1.0.3](48f6) Frontier outpost border shrinkage

[Taalen]

I just noticed that my frontier outpost lost a reasonable amount of border reach for no apparent reason:

Before
After

The shrinkage happened immediately after I finished enlightening an undeveloped species and they became my vassal. I fast-forwarded a few months, but the borders remained unchanged.

Attached save one day before it happens.

 

[Taalen]

Continued game using 1.1.0 beta patch, borders spread out to where they were in a couple of years. Sounds like the new vassal or some other trigger in the event reset a counter or something.