The important extract of the log:

Creative tab loop found when adding Block{quark:monster_box} next to Block{minecraft:spawner}

Had to split the paste. Part 1: https://pastebin.com/gRzw3eK8

Part 2: https://pastebin.com/8fYkFKcF

Part 3: https://pastebin.com/fpvRBBtg

Part 4: https://pastebin.com/V452yPuM

Part 5: https://pastebin.com/NuD4FNdW

#4764

It's also worth noting that a result of these errors is not only making creative tabs sometimes vanish but that they no longer exist conceptually either when queried, so recipe viewers such as EMI will not display items (or their recipes/usages) from said tabs

Can confirm this issue occurs on my end

It's also worth noting that a result of these errors is not only making creative tabs sometimes vanish but that they no longer exist conceptually either when queried, so recipe viewers such as EMI will not display items (or their recipes/usages) from said tabs

Closing as the other one is tracking this closer

I was just about to report this bug, I'm using quark 4.0-458 and zeta 1.0-19