When running unit tests or UI tests that cause a crash (even intentionally), the simulator itself crashes and can't be booted again in subsequent runs. This started happening from Xcode 26, our project never had this issue before (we had crashes before as well). Steps to Reproduce: Run the unit test with fatalError(). Observe the simulator crashes. On the next test run, the simulator fails to boot, remaining in a crashed or stuck state. Example error: error = Error Domain=FBSOpenApplicationServiceErrorDomain Code=1 "Simulator device failed to launch com.xxx.xctrunner." UserInfo={NSLocalizedDescription=Simulator device failed to launch com.xxx.xctrunner., NSUnderlyingError=0x600009895830 {Error Domain=FBSOpenApplicationServiceErrorDomain Code=1 "The request to open "com.xxx.xctrunner" failed." UserInfo={BSErrorCodeDescription=RequestDenied, NSLocalizedDescription=The request to open "com.xxx.xctrunner" failed., NSUnderlyingError=0x6000085d9500 {Error Domain=FBProcessExit Code=64 "The process failed to launch." UserInfo={NSUnderlyingError=0x60000850b360 {Error Domain=RBSRequestErrorDomain Code=5 "Launch failed." UserInfo=0x600008999340 (not displayed)}, BSErrorCodeDescription=launch-failed, NSLocalizedFailureReason=The process failed to launch.}}, FBSOpenApplicationRequestID=0xbe36, NSLocalizedFailureReason=The request was denied by service delegate (SBMainWorkspace).}}, NSLocalizedFailureReason=The request was denied by service delegate (SBMainWorkspace)., FBSOpenApplicationRequestID=0xbe36, SimCallingSelector=launchApplicationWithID:options:pid:error:, BSErrorCodeDescription=RequestDenied})

We have the following step before running any tests on CI machine: xcrun simctl shutdown all && xcrun simctl erase all It was working perfectly before Xcode 26.1. On Beta 3 it was doing it for 15 min every time. When updated to RC1, the tests with cached build are fast (clean goes up to 10 sec), but the package tests clean is still going up to 15 min every time. We did xcrun simctl runtime dyld_shared_cache update --all as advised but it's helping only temporarily. Is this going to be fixed in the official release?