Search using Regex is broken

[zabcik]

Issue Type: Bug

Search using Regex is broken when file is not opened in Editor...
If I open file then Regex searching works as expected.

There is sample of problematic Regex:
https://regex101.com/r/kFtSye/1

Pattern:
\bfield\b(.)\s\n*{[^\}]\s+FieldClass = FlowField;[^\}]}

VS Code version: Code 1.65.0 (b5205cc, 2022-03-02T11:12:08.962Z)
OS version: Windows_NT x64 10.0.19044
Restricted Mode: No

[roblourens]

This is the same underlying upstream issue as #131507