When tabcompleting commands that use a prefix like "minecraft:" it autocompletes the first result so in my case for the give command "minecraft:acacia_boat" while it should actually just complete the prefix in this case being "minecraft:". I'm not sure if this is a bug or not but the mechanic wasn't like this in 1.12.2 where it only completed the prefix on initial press.

If I want to for example write tnt I would have to tabcomplete and then delete the acacia_boat text which defeats the purpose of tabcompletion imo.

Demonstration (1.13): https://gyazo.com/44b4459a0276d7919c9cda1a31d267f9

Demonstration (1.12.2 - how it should be): https://gyazo.com/cdc2f612a7f4d5ada1f5e4991846615e