• VSCode Version:
  Version: 1.45.0-insider
  Commit: 4bd2068
  Date: 2020-04-29T05:33:59.143Z
  Electron: 7.2.2
  Chrome: 78.0.3904.130
  Node.js: 12.8.1
  V8: 7.8.279.23-electron.0

• OS Version:
  OS: Windows_NT x64 10.0.19035

Steps to Reproduce:

1. Create a snippet with the following code.

{
    "my test 1": {
        "scope": "",
        "prefix": [
            "test1"
        ],
        "body": [
            "${1:{}${2:fff}${1/[\\{]/}/}"
        ],
        "description": "my test 1"
    }
}

2. Invoke the snippet and this is what happened.

Expected behavior:

• Invoke the snippet, tab stop 1 (both {) is selected
• Press tab, last { changed to } and selection moved to fff

Actual behavior:

• Invoke the snippet, tab stop 1 (both {) is selected
• Press tab, last { changed to } and selection moved to fff}

Does this issue occur when all extensions are disabled?: Yes