wrangler only validates unexpected fields in the top level environment

[emily-shen]

What versions & operating system are you using?

wrangler 4.59.2

Please provide a link to a minimal reproduction

see below for wrangler config

Describe the Bug

{
"compatibility_date": "2025-07-14",
"compatibility_flags": [],
"main": "src/index.ts",
"name": "worker",
"env": {
"prod": {
"what": "fake"
}
},
}

should warn that 'what' is an unexpected field but doesn't

at a glance we need to add this check to (all?) environments: https://github.com/cloudflare/workers-sdk/blob/main/packages/workers-utils/src/config/validation.ts#L409

Please provide any relevant error logs

No response