NPR Hostility
With the advent of multi-system NPRs, it is far more likely now than you (or another NPR) will meet an NPR at the edge of its territory, where you do not pose an immediate threat. Consequently, you are less likely to get into a confrontation over disputed systems.
Therefore, there is now a chance that some NPRs will be automatically hostile, regardless of territorial concerns. If the primary species of the NPR has Xenophobia and Militancy above 50, there is a percentage chance equal to Xenophobia + Militancy - 100 that any first contact situation will result in the NPR declaring the new race as hostile. This is done on a case by case basis, so it will not necessarily be hostile in all cases.
As species characteristics are determined on 4 x D25, the average characteristic is 52. Therefore this check will be performed on slightly more than a quarter of NPRs and many of those will have a low probability. However, the existing Hostility Modifier in game option adds that modifier to both Xenophobia and Militancy, so increasing that number will result in more immediately hostile NPRs.
This immediate hostility does not prevent communication attempts.