I guess this is closely related to microsoft/vscode#10266

But slightly different. My case is that if I insert a new word directly in front of another and select auto-complete the whole following word is deleted.
Maybe I'm the only one who has the problem but I regularly delete worde because I forget to add a space first.

This is especially annoying if you have moved a variaable to anotehr clas and now have to prefix everywhere the new class instance. When you use autocomplete for the instances name you delete the property name after it if you haven't included a space, that you have to delete again before you can type '.'

Also when you are inside a word and trigger autocomplete '.' as completion trigger doesn't work