Incorrect backspace behaviour for Arabic Text

[kubaklatt]

📝 Provide detailed reproduction steps (if any)

1. Open for example RTL demo and type أهلاً وسهلاً
2. Press backspace

✔️ Expected result

After using backspace we should get أهلاً وسهلا

❌ Actual result

After using backspace we get أهلاً وسهل

📃 Other details

I checked how it looks in a contenteditable div and it works properly there.

• Browser: …
• OS: …
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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[Witoso]

@kubaklatt please share what browser, device, what keyboard (if Android mobile), etc. We need this information because Arabic is composed.