Installed ATM3 to try it for the first time. The game crashes before I make it to the main menu, pointing the finger at MalisisDoors. Here is the crash log.
crash-2020-03-04_19.09.03-client.txt

Considering how many other people are able to play ATM3, I'm wondering if maybe this has to do with my Java? I'm using OpenJ9, specifically version 1.8.0_212 (newer versions caused other oddities with other mods) as it seems to run MC better than regular Java.

More info on OpenJ9:
https://www.reddit.com/r/feedthebeast/comments/as6p87/java_vms_and_you_how_to_reduce_your_ram_and_cpu/ - reddit thread testing regular java vs openj9
https://steinborn.me/posts/tuning-minecraft-openj9/ - the GC settings I'm using
https://adoptopenjdk.net/archive.html?variant=openjdk8&jvmVariant=openj9 - where to get it

Edit: I tested disabling only MalisisDoors, and ATM3 loads now. I'm unable to join MP servers however.

Edit2: Further testing, I was able to get MalisisDoors to run without crashing in ATM3 by updating to OpenJ9 8.0.242.08, but unfortunately this latest version seems to have performance problems with MC (eclipse-openj9/openj9#8353), so I may have to go back to 212 or regular java.