bug(web): selecting ការ in predictive text then pressing space gives suggestions starting with ការ

For example:

1. select ការ
2. press spacebar
3. predictions show words starting with ការ - which does not really seem right
4. select ការងារ
5. result is កាការងារ

Not really sure what intent is but deleting រ from first instance of ការ is definitely wrong.

Keyman for Android 19.0.286-alpha
Khmer Angkor keyboard 2.4.1
Khmer Google Crawler lexical model 2.0

No file, test, or entry point is named. Start by reproducing the numbered steps with the listed Keyman Android, Khmer Angkor, and lexical model versions, then trace the predictive-text selection and spacing behavior; done means the reported duplication or incorrect deletion no longer occurs and the expected Khmer result is confirmed.

Written by the indexing model from the issue text.