CLI on Windows runs detached if TTY is not detected?

[NotJustAnna]

Hello! TS/Java dev here trying to use TailwindCSS!

I don't know if I'm doing something wrong. I'm trying to run Tailwind on a Gradle project and AFAIK the CLI spawns a new detached process and exits with zero. Half of the time this means that I end up with an empty css file when creating the final jar file.

Below is my Gradle's run, cleaned up a bit for help. Tailwind CLI apparently breaks away from Yarn and concurrently runs parallel to the rest of the execution...

I am doing something wrong? I don't seem to be able to reproduce this behaviour when running on my terminal. Or is this a bug?

09:12:07: Executing 'build'…

> Task :ui:compileJava UP-TO-DATE
> Task :ui:processResources UP-TO-DATE
[... a bunch of gradle tasks]
> Task :ui:yarnSetup UP-TO-DATE

> Task :ui:tailwindcss
yarn run v1.22.22
$ D:\project-root\ui\node_modules\.bin\tailwindcss -i D:\project-root\ui/src/main/resources/net/notjustanna/ui/tailwind.css -o D:\project-root\ui/build/generated/tailwindcss/net/notjustanna/ui/index.css
Done in 0.35s.

> Task :ui:jar UP-TO-DATE
[... a bunch of gradle tasks]
> Task :app:build UP-TO-DATE

BUILD SUCCESSFUL in 1s
14 actionable tasks: 1 executed, 13 up-to-date
≈ tailwindcss v4.0.12

Done in 22ms
09:12:08: Execution finished 'build'.

So far I've tried:

• The standalone Tailwind CLI
• Running it from NPX globally
• Installing it with NPM and running it
• Installing it with Yarn and running it
• Running it under a Script
• Running by directly calling node node_modules/@tailwindcss/cli/dist/index.mjs

All cases it detaches.
Tried Node.js v18.17.1 and v22.14.0
If I run it with a script, eg. "run-tailwind": "ping localhost -n 1 && yarn tailwindcss -o index.css && ping localhost -n 1", it detaches between the pings.

> Task :ui:tailwindcss
yarn run v1.22.22
$ ping localhost -n 1 && yarn tailwindcss -o index.css && ping localhost -n 1

Pinging DESKTOP-5J5IN85 [::1] with 32 bytes of data:
Reply from ::1: time<1ms 

Ping statistics for ::1:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms
$ C:\Users\Anna\IdeaProjects\all-you-need-is-java\ui\node_modules\.bin\tailwindcss -o index.css

Pinging DESKTOP-5J5IN85 [::1] with 32 bytes of data:
Reply from ::1: time<1ms 

Ping statistics for ::1:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms
Done in 0.52s.

> Task :ui:jar UP-TO-DATE