Hm, I’m successfully running 2025.2 EAP 252.23309.22 if I turn off “Attach coroutine agent” in the host IDE.
I’m using 2025.2 eap as host IDE and 2.6.1-SNAPSHOT of the Gradle plugin, haven’t tested with 2025.1. I’m using Gradle properties on the command line to override the IDE version, haven’t tested a custom runIde task.
If nothing works, you can always do remote debugging with an installed IDE.