Steam Deck on-screen keyboard not working for certain games

[moominfan]

Your system information

• Steam client version: 1660688177
• SteamOS version: 3.3.1 build 20220817.1
• Opted into Steam client beta?: No
• Opted into SteamOS beta?: No
• Have you checked for updates in Settings > System?: Yes

Please describe your issue in as much detail as possible:

When playing Star Wars Battlefront 2 (Classic, 2005) on the Steam Deck, manually bringing up the on-screen keyboard and typing on it does not enter any text in game. I expected to be able to type in in-game text input fields but the input is not recognized.

This issue seems to affect other users as well and does not seem to be limited to this game as seen in this reddit post.

Keyboard inputs through Steam input work flawlessly.

Steps for reproducing this issue:

1. Open Star Wars Battlefront 2 (Classic, 2005) on the Steam Deck
2. Manually bring up the on-screen keyboard with steam + x keys
3. Try to input text in any text field