The first character typed into a text field is not handled by the IME on macOS

On macOS, the first characters typed after a text field (chat, sign, book, search box, etc.) gains focus are committed immediately instead of being composed by the input method. With a Korean input source, typing 안녕하세요 results in ㅇㅏㄴ녕하세요: the first syllable 안 is broken into the separate letters ㅇ and ㅏ, because each of them was committed on its own instead of being composed into one syllable. (The ㄴ after them is simply the leftover consonant, since composition works again from 녕 onwards.) Deleting the broken characters and typing them again composes them correctly

This happens in unmodified Minecraft on macOS (no mods, no resource packs), and is reproducible from 26.1.x through 26.3-snapshot-5.

Steps to reproduce the issue

1. On macOS, add the Korean input source

2. Start Minecraft Java Edition [26.x] with no mods and enter any world.

3. Open chat screen, switch the input source to Korean, type any Korean text.

4. Type 안녕하세요. (key sequence: d k s s u d g k t p d y)

Expected result

Every syllable is composed by the input method: 안녕하세요

Actual result

The first syllable is not composed, its letters are committed separately: ㅇㅏㄴ녕하세요

Additional information

• Reproducible in vanilla, with no mods installed, on every version from 26.1.x to 26.3-snapshot-5. This covers both the GLFW-based versions and the SDL3-based 26.3 snapshots, so it does not look specific to one windowing backend.

• Only the characters typed right after the text field gains focus are affected; everything after them is composed normally.

• The common factor seems to be that text input is only enabled for the window once a text field gains focus, and the key presses arriving immediately after that are not routed into the input method's composition session, so they are committed as raw characters.