Chunky Turtles Not Keeping Chunks Loaded

[KawaiiHalo]

Description

I had a stack (49 tall) of chunky mining turtles excavating a 240x240 area. The turtles didn't even make it to the end of the first row before stopping. There are a few admin anchors in that area too. Is something else stopping them?

Steps to Reproduce

1. Set up chunky mining turtle
2. Run "Excavate" program (in my case it was 240)
3. Stay at the start and wait a couple minutes then check on the turtle.
   ...

Expected behavior: [What was supposed to happen]
Turtles keep their chunks loaded so as to continue mining with no problem.

Actual behavior: [What actually happened]
Turtles went about 2/3 of the specificed distance (~160 of 240; 10 chunks from player)

Stacktrace (if applicable): [PASTEBIN or HASTEBIN link to the stacktrace. Do NOT copy and paste the log into the issue post itself.]

Version affected: [The version of Peripherals++ and Forge]
P++ v1.3.6 (1.7.10)
Forge v10.13.4.1614

Additional Information

Mod was added along with ComputerCraft to the Gregtech: New Horizons modpack. I installed P++ about ~50 hours into a save, but CC was installed at the start of the save. I have not had any other problems with turtles or computers.