Crystal no longer runs GC in parallel threads?

I remember running Crystal apps through a profiler on my machine and it showed GC running outside the main thread, even without -Dpreview_mt. But now it seems to be running inside the main thread. Did something change in how Crystal runs the GC, or did the GC run itself differently, or am I just remembering incorrectly?

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What profiler are you using?

macOS Instruments