Hi, after some testing, i found out that when Quark world type 'Realistic' is enabled, forge doesn't register The Undergarden dimension. After talking with mod autors, I submited the bug in Quark git, The Undergarden dc, and now here con Forge. Undergarden's autor thinks it's a forge thing, a bug between modded world types and modded dimensions. Thanks!
debug.log - pastebin.com
Note that pastebin won't let me post the entire log, so i choose the last lines. If needed i could upload the entire thing.
I did test this thing really well, isolating every aspect of both mods, until finding the feature wich causes the bug.
Thanks!