give @s potato{display:{Name:"{\"translate\":\"gui.advancements\",\"italic\":false}"}}As of 18w03a this still causes the name displayed when selecting it in the hotbar to be displayed italicized.
Linked issues
is duplicated by 5
MC-124006
Italic names still appears
Resolved
MC-124779
Custom named items via /give with italics disabled still show up as italics when selected
Resolved
MC-126741
Item tooltip bug
Resolved
MC-127107
Italicized Custom Name on Items Even Though the Item is Not Italicized
Resolved
MC-128958
Summoned item name shows in a hotbar in italic despite setting italic to false
Resolved
relates to 2
Comments 16
This also is broken with the LocName tag, which did the same thing.
/give @p potato{display:{LocName:"Not Italic Potato"}}
Can also confirm. Bold works fine.
According to the wiki, italic normally defaults to false in translatable text components. However, renamed items default to having italicized names. I would therefore guess that the conflict is somehow causing the value of "italic" to be ignored.
6 more comments
Even if the name does not appear in italic in the inventory, it still appear in italic when selecting the slot of the item in the hotbar (in 18w19b)
michael
Confirmed for 18w01a.