bug(windows): Chromium typing issue with Spotify for Podcasters (slate.js)

### Describe the bug

Unable to type Malayalam in the `Episode Description` field on [Spotify for Podcasters.](https://podcasters.spotify.com/)

### Reproduce the bug

_**Note**: This will require an account on [Spotify for Podcasters](https://podcasters.spotify.com/). It's a free podcasting service._
1. After logging in, if you already have an audio file uploaded, go to [Episodes](https://podcasters.spotify.com/pod/dashboard/episodes) and click on it. Else click on `New Episode` and upload audio.
2. Click on the `Edit` icon and scroll down to `Episode description`.
3. Type imgleesh.
4. You'll get `ഷ്`.


### Expected behavior

`ഇംഗ്ലീഷ്`

### Keyman apps

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

### Keyman version

16.0.139

### Operating system

Windows 10 22H2

### Device

Windows Laptop

### Target application

https://podcasters.spotify.com/

### Browser

Brave Version 1.50.118 Chromium: 112.0.5615.87

### Keyboard name

mozhi_malayalam

### Keyboard version

3.2.3

### Language name

Malayalam

### Additional notes

Tried from an incognito window and Edge browser. Issue remains the same. Malayalam can be typed without issues by toggling the `HTML` switch under the `Episode description`.
And there is no issue in typing Malayalam elsewhere on the website.