[Bug] Tab only accept the empty space

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

https://microsoft.github.io/monaco-editor/playground.html?source=v0.47.0#XQAAAAJQAgAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3yscw1r3sCnGBGpWlpVktocO7_BJCkQTDFxvol36GvVmJLcE84C3knSa45xr2hL4V3CzK7RsXTTl3GKNcoe1EOluseUOqlAiRzt565Aikzvea61xWU_C6O4O4af9d95Ho8N37E04AP_F4QgtoH62aRToKkEAPJZoSsZZfAcW23V_8iVY6IVDJixX7Qj5iTFcYx3oLLpyOrtWl5zCHbN-ayZrwUeHldP8jznwshtDv_rgKRk-aCws0DDW2EPOv5b5f_xemFBnpV9OH_7CG5c1Z7OsTHfGIu7oi9k30gjuf2n26CCHN7kRQ-Sye4CP3wTY_3KIXJzrmOTR4TMCrfTPmM8Oi2diYm4dP9RHHrmilKrj-bUnY

Monaco Editor Playground Code

monaco.languages.registerInlineCompletionsProvider("sql", {
	provideInlineCompletions: function (model, position, context, token) {
		console.log('Provide new completion', position, context, token)
		return {items: [
                    {
                        insertText: '  buhao'
                    },
                ]};
	},
	freeInlineCompletions: function (completions) {
		console.log(completions);
	},
}); 

monaco.editor.create(document.getElementById("container"), {
	value: 'SELECT\n  *',
	language: "sql",
});

Reproduction Steps

1. Open the playground
2. Type an enter
3. You will see ' buhao' suggested
4. Tab
5. You will see empty space accepted

Actual (Problematic) Behavior

Tab can only accept empty space

Expected Behavior

Tab accept the full suggestion

Additional Context

https://github.com/microsoft/monaco-editor/assets/109033553/81f3a38b-1bd9-4201-8034-3e3b6bcf6ed7

Try on 0.43,0.44,0.47, all don't work. Have to mention, sometimes it works, sometimes it doesn't. Not sure what's the pattern

Start with the Monaco Editor Playground link and the inline completions provider code in the issue. Reproduce the SQL example across the mentioned Monaco versions, focusing on how Tab handles the suggestion with leading spaces and the reported intermittent behavior. Done means Tab consistently accepts the full “ buhao” suggestion rather than only the empty space.