Environment:

Jetpack Compose version: 1.7.3
Jetpack Compose component(s) used: TextField
Android Studio Build: Android Studio Koala Feature Drop | 2024.1.2 Patch 1
Kotlin version: 2.0.20
Devices: Xperia 1, Xperia ZL2, Xperia XZ2 Premium
IME: POBox Plus

Issue Summary:
In Jetpack Compose 1.7, when using the POBox IME on Xperia devices, certain Japanese characters such as small characters (e.g., "っ", "ゃ", "ゅ", "ょ") and diacritic marks (dakuten, handakuten) cannot be input into a TextField. Additionally, toggle input (e.g., pressing 'あ' multiple times to switch to 'い', 'う', etc.) does not work as expected.

Steps to Reproduce or Code Sample to Reproduce:

Use a Sony Xperia device with the POBox IME.
Open a Jetpack Compose 1.7 app that contains a TextField.
Attempt to input Japanese characters using a Japanese keyboard (IME), including small characters (e.g., "っ", "ゃ", "ゅ", "ょ") and diacritic marks (dakuten, handakuten), as well as toggle input (e.g., pressing 'あ' multiple times to change it to 'い', 'う', etc.).

For a detailed demonstration of the issue, please refer to the attached reproduction video.

Actual Results:

Small characters like "っ" (small tsu) and "ゃ, ゅ, ょ" (small ya, yu, yo) cannot be entered.
Diacritic marks (dakuten and handakuten) cannot be added to characters.
Toggle input does not work. For example, pressing 'あ' three times should result in 'う', but instead results in 'あああ'.

Expected Results:

Users should be able to input small characters like "っ", "ゃ", "ゅ", "ょ".
Diacritic marks (dakuten and handakuten) should be added properly when required.
Toggle input should function correctly, allowing users to change characters by repeatedly pressing the same key (e.g., 'あ' -> 'い' -> 'う').

Reproduction Rate:

100%
This issue occurs every time under the described conditions.

Environment:

This issue happens regardless of the Android OS version.
The problem occurs specifically on Xperia devices using the POBox IME when Jetpack Compose 1.7's TextField is used.
Jetpack Compose 1.6 does not exhibit this issue.

Additional Information:

According to our investigation, POBox is pre-installed on Xperia devices up to the Xperia 1, released in 2019 (https://www.sony.jp/xperia/xperia/xperia1/?srsltid=AfmBOoox1BTdp0e7TprBv0hcGsft9wxrpNf_-KepPYoCqf6QgXX6axE1). As a result, this issue could affect a significant number of Android users in Japan.

While we suspect the issue may be related to the combination of Xperia devices and POBox, we would greatly appreciate your investigation into a potential solution or workaround within Jetpack Compose.

Workaround Attempted:

As a workaround for this issue, we attempted to directly use EditText within AndroidView by utilizing ViewBinding in the Compose environment. However, we encountered another issue in our project that prevented us from using this workaround effectively.

It would be greatly appreciated if you could also prioritize investigating and addressing this issue. Here is the link to the related issue:
https://partnerissuetracker.corp.google.com/issues/369354336#comment4

Sample App to Reproduce:
You can reproduce the issue using this app:
https://github.com/yurihondo/screentransitionsample

Please especially check the implementation at the following location:
https://github.com/yurihondo/screentransitionsample/blob/c71e4d6f41c76cdeb8a359e3cc6938a5250ac5da/feature/applepie/src/main/java/com/yurihondo/screentransitionsample/applepie/EditRoute.kt#L76