bug(mac): dot below causes characters to be deleted on Chrome

### Describe the bug

I created an LDML keyboard with `` and then exposed it in the keyboard in an alt modifier layer. I then got a series of unexpected character deletions:

e.g. in Google Drive:

```
Typed: m alt+. n+alt+.
Received: "ṇ"
Expected: "ṃṇ"

and in the search bar:
Typed: m alt+.
Received: "mṃ"
Expected: "ṃṇ"
```

This is also reproducible in https://keymanweb.com/ but the error was not reproduced in the "Notes" Mac app.

### Reproduce the bug

Here's the basic LDML keyboard that can be compiled to reproduce the error by typing the keys described above.

```xml

```

### Expected behavior

_No response_

### Related issues

_No response_

### Keyman apps

- [ ] Keyman for Android
- [ ] Keyman for iPhone and iPad
- [ ] Keyman for Linux
- [X] Keyman for macOS
- [ ] Keyman for Windows
- [ ] Keyman Developer
- [ ] KeymanWeb
- [ ] Other - give details at bottom of form

### Keyman version

17.0.330

### Operating system

Mac OS Monterey

### Device

Macbook Pro

### Target application

_No response_

### Browser

Chrome 128.0.6613.139

### Keyboard name

_No response_

### Keyboard version

_No response_

### Language name

_No response_

### Additional context

_No response_