Samsung Keyboard doesn't show predictive text (T9) in Ionic 7 Android app (ion-textarea & textarea both fail)

I'm developing an Android app using Ionic 7 + Capacitor, and I'm facing a frustrating issue: Samsung Keyboard does not show predictive text suggestions (T9) in my app — neither with <ion-textarea> nor with native <textarea>.

What I tried:

1. <ion-textarea>:

   <ion-textarea 
      [(ngModel)]="xxx[0]" 
      placeholder="Note"
      [autoGrow]="true"
      inputmode="text"
      autocomplete="on"
      autocorrect="on"
      autocapitalize="sentences"
      rows="4">
   </ion-textarea>
   

   Predictive text doesn't show.

2. <textarea>:

   <textarea
      [(ngModel)]="xxx[0]"
      placeholder="Note"
      rows="4"
      inputmode="text"
      autocomplete="on"
      autocorrect="on"
      autocapitalize="sentences">
   </textarea>
   

   Still no predictive text.

3. Tried ion-input with type="text":

   <ion-input
      type="text"
      inputmode="text"
      autocomplete="on"
      autocorrect="on"
      autocapitalize="sentences">
   </ion-input>
   

   Still doesn't show T9 suggestions.

What works:

T9 works perfectly in other apps (e.g., WhatsApp) on the same Samsung tablet.

When I switch to Gboard or SwiftKey, suggestions do show inside my app.

Environment:

Ionic 7
Capacitor 6
Android (Samsung Tablet with Samsung Keyboard, Turkish)

Using Capacitor Keyboard plugin:

await Keyboard.setResizeMode({ mode: KeyboardResize.Body });
await Keyboard.setAccessoryBarVisible({ isVisible: false }); // I also tried disabling this line.

WebView-based app (Capacitor)

Samsung Keyboard doesn't show suggestion bar, just emojis and symbols.

My question:

Is this a known limitation with Samsung Keyboard + WebView?

Is there a workaround to force predictive text on Samsung Keyboard?

Any plugin or native Android solution (e.g. imeOptions) that could help?

Any suggestions or workarounds would be appreciated. This is a medical app where predictive typing significantly helps our nurses.