GitHub Copilot adds unwanted spaces

[jishanalibd]

Select Topic Area

Bug

Copilot Feature Area

Copilot in GitHub

Body

Bug Description

GitHub Copilot Chat on github.com consistently adds unwanted spaces after dots (.) when generating code, especially in JSON, JavaScript expressions, and URLs.

Examples of the Bug

What Copilot Outputs	What It Should Be
github. com/orgs/community/discussions	github.com/orgs/community/discussions
$json. content	$json.content
$json. conversation? . status	$json.conversation?.status
typeVersion": 2. 1	typeVersion": 2.1
$now. toISO()	$now.toISO()
<? php	<?php

Impact

• Breaks code: Users who copy-paste generated code get syntax errors
• Breaks JSON: Invalid JSON that fails to parse
• Breaks URLs: Links don't work
• Wastes time: Users must manually find and fix all occurrences

Environment

• Platform: github.com Copilot Chat
• Date: December 2025
• Observed in: Long conversations with code generation

Additional Context

This bug persists even after being told about it multiple times in the same conversation. The AI acknowledges the bug but continues making the same mistake.

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[varadharajaan]

same for me, it has been happening in the last couple of days.

[anydeploy-com]

i have the same issue for days - it's frustrating

[Lukino811]

Same for me

[HadiMahami]

same for me

[Emberwhirl]

Same for me

[gmgallo]

I'm also experiencing this issue randomly appearing on C++/WinRT generated code, nuspec and nugget target files. and any other file that has texttext or characters affecting any text sequence containing relative paths and file extensions. Very annoying!

[danieljscosta]

I’m having the same problem here. About three months ago everything was working perfectly, and now, all of a sudden, it’s seriously interfering with my work. When I subscribed to the service, it was precisely to help with productivity, but in the past few weeks I’ve been spending a huge amount of time trying to track down this error in every code generation, and it’s always there. It happens after a period (.) and also after a colon (:).

[gmgallo]

It's like the thing loose context of what it is generating code vs. normal writing, where you expect spaces after those punctuation marks. If you have too many lines of code to review it would be worth to invest a few minutes writing a grep script to remove those spaces unless they are withing string literals. I use TextPad which has grep search and replace.

[hairetikos]

+1

sometimes it also ommits generated filename extensions completely for example

main.cpp is generated as main.

besides the existing reported issue for example:

default. clock.max-quantum = 2048
instead of
default.clock.max-quantum = 2048

model: Claude (sonnet, opus, both do it)

[ijb-ijb]

Same here with a PowerShell Script. Each iteration adds those spaces at random locations behind a . or :. Automatically replacing them seems not to be a good idea since it may match valid content.