Diagnostics show twice

[G0rocks]

Problem is that every time rust-analyzer gives any diagnostics (warnings, errors or other) ot shows up twice.
It does so both in the problem windows at the bottom of the screen and when hovering a mouse over a word with squiggly lines underneath it.

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)
rust-analyzer version: 0.3.2474-standalone (d2f1787 2025-05-23)

rustc version: (eg. output of rustc -V)
rustc 1.87.0 (17067e9ac 2025-05-09)

editor or extension: (eg. VSCode, Vim, Emacs, etc. For VSCode users, specify your extension version; for users of other editors, provide the distribution if applicable)
Vscode

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)

repository link (if public, optional): (eg. rust-analyzer)
https://github.com/G0rocks/marine_vessel_simulator

code snippet to reproduce:

// add your code here
No specific one, it just happens every time I change something and save I get all warnings and/or errors twice

VSCode version: 1.100.2
Operating system: Windows 10 pro 19045.5854
Cargo version: 1.87.0 (99624be96 2025-05-06)

See also issue #18997 where davidbarsky thinks the diagnostics I'm seeing are from rustc by way of Cargo.

[G0rocks]

Example image