Modpacks can't be interdependent

[rubenwardy]

ContentDB considers packages as a whole. It collects all the dependencies of the mods in the modpack into a single list and this is used for dependency resolution and game support

Say you have the following two packages:

Alpha package with mods alpha1 and alpha2
Beta package with mods beta1

alpha1 depends on beta1
beta1 depends on alpha2

Minetest will successfully load these mods in the order alpha2, beta1, alpha1. However, ContentDB will see this as a dependency cycle between the two packages, as Alpha depends on Beta and Beta depends on Alpha.

For an example of this in the wild, see joe7575/techage_modpack and rheo/moreblocks.