Unable to lint non .sql files

[Enduriel]

My sqlfluff version is v3.0.2
System info:

Version: 1.89.1 (system setup)
Commit: dc96b837cf6bb4af9cd736aa3af08cf8279f7685
Date: 2024-05-07T05:13:33.891Z
Electron: 28.2.8
ElectronBuildId: 27744544
Chromium: 120.0.6099.291
Node.js: 18.18.2
V8: 12.0.267.19-electron.0
OS: Windows_NT x64 10.0.22631

I'm not able to lint sql files with extensions other than .sql, they seem to be complete ignored by the extension, this is especially strange because the formatter still works and runs correctly. I have tested this with .postgres and .sqlite3 file extensions.

This is a snippet of my settings.json

    "sqlfluff.linter.languages": [
        "sql",
        "sqlite",
        "sqlite3",
        "sql-bigquery",
        "jinja-sql",
        "postgres",
        "snowflake-sql"
    ],
    "files.associations": {
        "*.sqlite3": "sqlite"
    },
    "sqlfluff.format.languages": [
        "sql",
        "sqlite",
        "sqlite3",
        "sql-bigquery",
        "jinja-sql",
        "postgres",
        "snowflake-sql"
    ],

As I said, the formatter options work and format my files, additionally if I rename the files to .sql they work fine, but any other of the specified languages doesn't work, this is even though I have the correct file -> language associations set up.

[keraion]

Let's focus on one language first. Which extension are you using for the postgres language? Is it ckolkman.vscode-postgres? If so, does it work with .pgsql or .psql files?