Scheduler fails in stress_async_basic on qemu_riscv64.debug

```
[       OK ] stress_allocator
[ RUN      ] stress_async_basic
panicked at ../../kernel/kernel/src/scheduler/mod.rs:166:5:
assertion failed: ok
Oops: assertion failed: ok
```
See https://github.com/vivoblueos/kernel/actions/runs/20922510258/job/60111669857.