translation.test.invalid2 doesn’t work properly in non-US English language

The Bug

When the language is set to non-US English, the debug string translation.test.invalid2 doesn't work properly.

How to Reproduce

1. Set the language to US English.
2. Run the command and observe that “hi %  s” was printed:

   /tellraw @s {"translate": "translation.test.invalid2", "with": ["123"]}

1. Set the language to UK English, or any language other than US English.
2. Run the command:

   /tellraw @s {"translate": "translation.test.invalid2", "with": ["123"]}

   → “hi %  s” is not printed and “hi 123” was printed.

Expected Behavior

“hi 123” will not be printed and “hi %  s” will be printed.