Prior to 18w14a, the debug menu only worked in the natural "game environment."
In 18w14a, the debug menu only worked while an inventory was opened (MC-127911).
In 18w14b, the debug menu still works while an inventory is opened. This does not affect container inventories, but seemingly only the survival/creative main inventories.
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Comments 13
I tested if I could open debug while looking inside a cheast, in 18w44a, and it did not happen a thing. I pressed F3 and nothing happend, but when i went ouut of debug, I could then open debug.
Confirmed for 1.13.1.