Preemptive Thread uses 100% CPU

Here’s a simple app which has a loop in the main thread, and a loop in a Thread. Both loops spend most of their time sleeping, e.g.

while true
   [... do some simple string operations ...]
   sleep(10)
wend

When run using a Cooperative thread, CPU usage is low (a few %) as expected.
When run using a Preemptive thread, CPU usage is pegged at 100%.

preemptiveCPU.zip (6.3 KB)

Reported as https://tracker.xojo.com/xojoinc/xojo/-/issues/77526

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