crash press multi_text_key from a popup

[Noneangel]

Describe the bug
If a key like { "$": "multi_text_key", "codePoints": [66, 108], "label": "T" } is pressed from a popup, the app crash.

To Reproduce

1. On a fresh install
2. Uncheck Use system languages
3. Edit English (United States) layout
4. Add a custom layout
5. Copy existing layout AZERTY (it provides a JSON config)
6. Edit this custom layout
7. replace { "label": "a" }, with

{
  "label": "a",
  "popup": {
    "relevant": [ { "$": "multi_text_key", "codePoints": [ 66, 108], "label": "Upper" } ]
  }
},

or use this layout.json
8. in a field (like on the search bar of the Firefox android app). trigger the key (in this example, long press a, release on Upper). The keyboard close (some time with an android popup saying that the app crashed).

HeliBoard_log_1740004360646.txt

App version
2.3

Device:

• Model: google Pixel 4a
• OS: Android 13 - manufacturer's OS