Our latest Insiders release has a new multi-root implementation (which fixes this bug): https://github.com/microsoft/vscode-cpptools/releases/tag/0.27.0-insiders. Please let us know if you find any multi-root-related bugs or regressions so we can prioritize fixing those for 0.27.0.

I am affected by the bug. My working directory is a symlink, and once in a while when I reformat the code my file becomes corrupted. I am using /0.27.0-insiders2

Originally posted by @olzhas in #1073 (comment)