vs code can't replace using regex group references under PCRE2 mode

I'm trying to replace my std stl usage to EASTL and since i have a lot of cpp/h files, i'm relying in 'Search in Files' option of vs-code, with the following pattern:

((?<=#include \<)([^\/(.h)]+?)(?=\>))

This matches completely fine in regexr.com, in both match and replace and in vs code as well but needs the option of PCRE2 engine being enabled due backreferences use.

Trying to reference the matching group #1 using $1 under Search sidebar view simply doesn't work, and just adds "$1".

But if i search & replace with the same input for each file manually, it works as intended.

Thanks.