`check_outdated_packages_on_open` not respected

I've searched open issues for similar requests

• Yes

I've recently downloaded the latest plugin version of mason.nvim

• Yes

Problem description

The check_outdated_packages_on_open option does not seem to work reliably when set to false.

Expected behavior

When setting check_outdated_packages_on_open = false, updates should never be fetched upon opening :Mason.

Steps to reproduce

Use this lazy.nvim spec:

{
    "mason-org/mason.nvim",
    lazy = true,
    opts = {
        ui = {
            check_outdated_packages_on_open = false,
            height = 0.8,
        },
    },
},

I don't know what exactly reproduces the issue, as the registry update only happens sometimes, but it definitely happens.

Neovim version (>= 0.10.0)

NVIM v0.11.3
Build type: Release
LuaJIT 2.1.1753364724
Run "nvim -V1 -v" for more info

Operating system/version

Darwin 24.5.0

Healthcheck output

==============================================================================
mason:                                                                    4 ⚠️

mason.nvim ~
- ✅ OK mason.nvim version v2.0.1
- ✅ OK PATH: prepend
- ✅ OK Providers: 
    mason.providers.registry-api
    mason.providers.client
- ✅ OK neovim version >= 0.10.0

mason.nvim [Registries] ~
- ✅ OK Registry `github.com/mason-org/mason-registry version: 2025-07-31-hushed-phoenix` is installed.

mason.nvim [Core utils] ~
- ✅ OK unzip: `UnZip 6.00 of 20 April 2009, by Info-ZIP, with modifications by Apple Inc.`
- ✅ OK wget: `GNU Wget 1.25.0, a non-interactive network retriever.`
- ✅ OK curl: `curl 8.7.1 (x86_64-apple-darwin24.0) libcurl/8.7.1 (SecureTransport) LibreSSL/3.3.6 zlib/1.2.12 nghttp2/1.64.0`
- ✅ OK gzip: `Apple gzip 457.120.3`
- ✅ OK tar: `bsdtar 3.5.3 - libarchive 3.7.4 zlib/1.2.12 liblzma/5.4.3 bz2lib/1.0.8 `
- ✅ OK bash: `GNU bash, version 3.2.57(1)-release (arm64-apple-darwin24)`
- ✅ OK sh: `Ok`

mason.nvim [Languages] ~
- ⚠️ WARNING luarocks: not available
  - ADVICE:
    - spawn: luarocks failed with exit code - and signal -. Could not find executable "luarocks" in PATH.

- ⚠️ WARNING Composer: not available
  - ADVICE:
    - spawn: composer failed with exit code - and signal -. Could not find executable "composer" in PATH.

- ⚠️ WARNING PHP: not available
  - ADVICE:
    - spawn: php failed with exit code - and signal -. Could not find executable "php" in PATH.

- ✅ OK Ruby: `ruby 2.6.10p210 (2022-04-12 revision 67958) [universal.arm64e-darwin24]`
- ✅ OK Go: `go version go1.24.5 darwin/arm64`
- ✅ OK cargo: `cargo 1.88.0 (873a06493 2025-05-10)`
- ✅ OK node: `v24.4.1`
- ⚠️ WARNING julia: not available
  - ADVICE:
    - spawn: julia failed with exit code - and signal -. Could not find executable "julia" in PATH.

- ✅ OK python: `Python 3.13.5`
- ✅ OK RubyGem: `3.0.3.1`
- ✅ OK java: `openjdk version "21.0.8" 2025-07-15 LTS`
- ✅ OK npm: `11.4.2`
- ✅ OK javac: `javac 21.0.8`
- ✅ OK pip: `pip 25.1.1 from /opt/homebrew/lib/python3.13/site-packages/pip (python 3.13)`
- ✅ OK python venv: `Ok`

Screenshots

No response

Start by tracing how check_outdated_packages_on_open is handled when opening :Mason, using the provided lazy.nvim configuration to reproduce the intermittent registry update. Done means setting the option to false reliably prevents updates from being fetched whenever :Mason opens.