Using ember generate <whatever> <name> errors out

[Jopie01]

Created a brand new app with

npx ember-cli@latest new new_fancy_app -b @embroider/app-blueprint --pnpm --skip-git --skip-npm

and did some testing to make sure live-reload works. Then I wanted to create a new route with ember generate route otherroute but it failed with

unknown file: Cannot read properties of undefined (reading 'replace')

The stack trace:

TypeError: unknown file: Cannot read properties of undefined (reading 'replace')
    at cleanUrl (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@embroider/shared-internals/src/paths.js:54:16)
    at PluginPass.enter (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@embroider/shared-internals/src/template-colocation-plugin.js:28:57)
    at newFn (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/visitors.js:172:14)
    at NodePath._call (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/path/context.js:49:20)
    at NodePath.call (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/path/context.js:39:18)
    at NodePath.visit (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/path/context.js:85:31)
    at TraversalContext.visitQueue (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/context.js:89:16)
    at TraversalContext.visitSingle (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/context.js:65:19)
    at TraversalContext.visit (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/context.js:112:19)
    at traverseNode (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/traverse-node.js:22:17)
    at traverse (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/traverse/lib/index.js:53:34)
    at transformFile (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/core/lib/transformation/index.js:82:31)
    at transformFile.next (<anonymous>)
    at run (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/core/lib/transformation/index.js:24:12)
    at run.next (<anonymous>)
    at transform (/home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/core/lib/transform.js:22:33)
    at transform.next (<anonymous>)
    at step (/home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:261:32)
    at /home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:273:13
    at async.call.result.err.err (/home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:223:11)
    at /home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:189:28
    at /home/embertesting/new_fancy_app/node_modules/.pnpm/@[email protected]/node_modules/@babel/core/lib/gensync-utils/async.js:67:7
    at /home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:113:33
    at step (/home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:287:14)
    at /home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:273:13
    at async.call.result.err.err (/home/embertesting/new_fancy_app/node_modules/.pnpm/[email protected]/node_modules/gensync/index.js:223:11)

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For now I fixed it by adding an if statement to the cleanUrl function which checks if the variable is not undefined, else I return an empty string

embroider/packages/shared-internals/src/paths.ts

Line 50 in c2dff54

export function cleanUrl(url: string): string {

But that's probably not the right solution (more like a bandage), but I lack the knowledge to dig deeper into this.