The bug

Because commands in a function are trimmed by java.lang.String#trim, greedy strings cannot contain trailing spaces (U+0000 .. U+0020) in a function.

Affected commands

• /advancement grant <targets> only <advancement> <criterion>
• /advancement revoke <targets> only <advancement> <criterion>
• /say <message>

How to reproduce

1. Install the datapack in Attachments.

2. /function mc-174587:test

   → revoked, the criterion "criterion with a trailing space " is not granted correctly.

• mc-174587/advancement/test.json

  {
      "criteria": {
          "criterion with a trailing space ": {
              "trigger": "minecraft:impossible"
          }
      }
  }

• mc-174587/functions/test.mcfunction

  advancement grant @s only mc-174587:test criterion with a trailing space 
  execute if entity @s[advancements={mc-174587:test=true}] run say granted
  execute if entity @s[advancements={mc-174587:test=false}] run say revoked