Thread Sanitizer is not available for selected run destination

I'm building a pretty standard iOS app, 64 bit, etc. I was able to turn on Thread Sanitizer in one of my Xcode Schemes (my background app scheme), but now I can't turn it on in my dev scheme. I've turned off all the other debug settings in the scheme, cleaned the project and restarted Xcode, no luck.

Any suggestions?
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Of course, run destination was the key point. I was debugging on a 5s, which apparently isn't 64 bit. Switching to an iPhone 8 simulator fixes the problem. my bad.
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