sources / plugin / env doesn't show that there are values #29357

Checklist:

• I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• I've included steps to reproduce the bug.
• I've pasted the output of argocd version.

Describe the bug

I have a three source application (two sources only differ by env), the plugin env section doesn't show anything:

<div class="row white-box__details-row"><div class="columns small-3">ENV</div><div class="columns small-9"><div style="margin-top: 15px;"></div></div></div>

To Reproduce

1. Create an application with three sources (two of which are plugins with different env values)
2. Visit the application in argocd
3. Select the sources tab
4. Collapse all sources
5. See that ENV= information isn't shown
6. Expand the source that should have an env
7. scroll down to the plugin part and look at env
8. Click EDIT
9. See that the env information is available

Expected behavior

1. The one line blurb that shows PATH=..., REVISION=... should also show ENV=... (especially if two sources only differ by ENV) (5)
2. The env details should be shown (7)

Screenshots

Version

{
    "Version": "v3.5.1",
    "BuildDate": "2026-08-12T11:28:06Z",
    "GitCommit": "109ca7ca71139e514114499d294a492e7910a965",
    "GitTag": "v3.5.1",
    "GitTreeState": "clean",
    "GoVersion": "go1.26.4",
    "Compiler": "gc",
    "Platform": "linux/amd64",
    "KustomizeVersion": "v5.8.1 2026-02-09T16:15:27Z",
    "HelmVersion": "v4.2.1+gd591a19",
    "KubectlVersion": "v0.36.1",
    "JsonnetVersion": "v0.22.0"
}

Logs

Paste any relevant application logs here.