Something I discovered messing around on the editor and K75 said to post here:
If you put multiple siphons on a resource pack, when the pack is depleted, the game will stop updating. All of the menus still work fine, but packets don't move creeper doesn't flow, and the map in general can't be interacted with. This is particularly noticeable with energy packs, since 2 siphons on that causes it to instantly deplete.
Attached is a log and a map just prior to this occurring.
That's well noticed, but unlikely to get fixed, I think. There is few similar bugs existing.
And I wonder why somebody would pre-place siphon to resource pack unless mapmaker wants make easy start? :)
Sorry if that sounds mean, emotions don't transfer well in text.
Even if this doesn't get fixed, I know of at least one instance where the occurrence of a bug was used to prevent a similar event from causing issues in the next game. :) Thanks for taking the effort. :)
For reference, something with a (possibly) different cause and the same result:
https://knucklecracker.com/forums/index.php?topic=20911.0