"editor.suggest.insertMode": "replace" not working at start of work in TypeScript

[eamodio]

Issue Type: Bug

Related #91104

VS Code version: Code - Insiders 1.43.0-insider (9c341b3, 2020-02-20T05:39:38.179Z)
OS version: Windows_NT x64 10.0.19041

System Info

Item	Value
CPUs	AMD Ryzen 9 3900X 12-Core Processor (24 x 3800)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	31.95GB (16.15GB free)
Process Argv
Screen Reader	no
VM	0%

[jrieken]

Yes - there is a reasonable default but every language needs to implement this by themselves

[mjbvz]

@eamodio Please share repo steps and example code

[eamodio]

@mjbvz It happens when starting the auto-complete from a ., it seems to work if there is one or more characters

Fails:

Works:

[mjbvz]

Repo

class Foo {
    bar = 1;
    bad = 1;

    foo() {
        this.bar
    }
}

1. Place cursor after . in this.bar
2. Trigger suggestions and accept a replacement for bad

Expected
this.bad

Actual
this.badbar (🐘)