Strange behavior when start typing then selecting one of the suggested words in react-ace

[hazem-alabiad]

2021-12-07-13-56-34.mp4

When clicking on Ctrl+Space then selecting a suggested word everything works as expected however when I start typing the first letters of the desired word then select one of the suggested words I see strange behaviors go on e.g. "Adding an extra letter in the beginning, removing the space before the suggested word, ...etc"
Is it is a bug in ace, any suggestion on where I should look for bugs?