So, I was messing with structure blocks and was trying to save a structure, the thing is that when trying to save as "Structure" as its name, nothing happens, neither a message telling it failed... I then activated the console and saw this: "Non [a-z0-9/._-] character in path of location: minecraft:Structure". So, in that regex, uppercase is not defined. That's ok, tho, but I had to open the console to see an error, nothing is warned on chat. A message on chat should be added saying it failed.