I came across the following issue:
Some posts will not load all the plugins, even though the same rules apply for all.
In trying to see what the problem is, I found two issues:
1. I can't change order for network activated plugins. Those seem to always go last, which can cause problems.
2. I disabled many plugins from global settings, leaving only some. Some pages will load properly, some will not. This is frustrating because if I enable all in the post itself and then recreate the same settings there, it will sometimes work.
It still looks like an order issue, but can't figure it out.