bug(ios): Initial key stutter and duplication

**Describe the bug**
After user switches to or activates the keyboard, The first one or two keys clicked get duplicated, with a noticeable lag with the keyboard. E.g. intended λύω becomes λυλύω, οὖν becomes οὐοῦν or ὀοῦν, τρεῖς becomes τρτρεῖς, τρετεῖς, or ττρεῖς.

**To Reproduce**

1. Go to Notes
2. Switch to keyman from another keyboard
3. Input letters
4. See error

**Expected behavior**
One gets the exact letters clicked.

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**Keyman for iPhone/iPad/Android:**
- Device: iPhone X
- OS: iOS 15
- Keyman version: 14.0.282
- Target application: Notes

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**Keyboard**
- Keyboard name: Polytonic Greek (SIL)
- Keyboard version: 1.5
- Language name: Ancient Greek

**Additional context**
Restarting or reinstalling seems not to have solved the issue.