Actually Additions version: 1.12.2-r152
Forge: 14.23.5.2847

A crash concerning item lasers, item interfaces, and phantomfaces was recently discovered. After the crash occurred, the player was not able to rejoin the world. A 100% reproducible crash occurred in this setup below:

In this setup, the two item lasers are connected to each other normally, with no priority modifications or anything like that. The phantomface is linked to the item interface. To initiate the crash, simply place an item in the hopper.

The crash report is as follows: https://pastebin.com/QxgmGP41

This was also reproduced in another setup:

Where instead of using a vanilla hopper, a Gregtech Community Edition chest with a cover was used to move items into the phantomface.

The crash report for this case is: https://pastebin.com/vqJcDb8m