Tested in: 1.29.163451
Mods: Community Framework, Community Online Tools
The issue you described is not present. All seed packs (including the one that does not spawn) can be opened, planted, and grow. Everything is working as intended.
It is either an issue with the mods; or often times, server owners disable these things on servers that already have a bunch of entities spawning.
Neither of these cases are something for which bohemia can provide support.