I tried exporting all of my packages and ran into issues with triggers specifically. With packages that don't have any triggers, the src/triggers directory is still created, with a triggers.json containing only null. When there -are- triggers, if they're directories, the info of those directories is not preserved because the triggers.json is once again just null. This applies to all directory properties, including order, enable state, etc. I've attached an mpackage to test the latter issue against, with .zip added to allow upload to github.
TriggerTest.mpackage.zip