got empty list of simulators in destination tree with Xcode Version 26.0 (17A324)

[BugenZhao]

Hi, and thanks for your excellent work!

After upgrading Xcode to the latest version, 26.0, from the App Store today, I noticed that the simulators no longer appear in the destination list. Refreshing or restarting didn't work at all.

...while in Xcode:

By inspecting the source code, I discovered it's obtained by calling command xcrun simctl. Then I found something weird when I tried running it in my terminal: the standard output format indeed shows all simulators I've created, while the JSON output is empty:

/Volumes/Black/Developer/MNGA main*
❯ xcrun simctl list devices                
== Devices ==
-- iOS 17.0 --
-- iOS 17.0 --
-- iOS 26.0 --
-- iOS 26.0 --
    iPhone 16 Pro (87D5AFE2-5B9B-4CC1-8165-F7AC6F938E4D) (Shutdown) 
    iPad Pro 11-inch (M4) (145C5916-A65C-4796-9A3B-45EC78F9548C) (Booted) 
-- iOS 26.0 --

/Volumes/Black/Developer/MNGA main*
❯ xcrun simctl list devices -j      
{
  "devices" : {
    "com.apple.CoreSimulator.SimRuntime.iOS-26-0" : [

    ],
    "com.apple.CoreSimulator.SimRuntime.iOS-17-0" : [

    ]
  }
}

I believe this is the root cause of my issue, but I'm still unsure whether it's a problem with Xcode or a misconfiguration on my part. I would appreciate it if you could investigate this to see if it can be reproduced. Thanks in advance!

[BugenZhao]

Noticing that there are multiple iOS 26.0 entries in standard output, I guess if it could be something wrong when simctl merging them. Then I tried removing the outdated simulators from Xcode settings...

Everything is now going well! (also ~50G is saved on my disk 😄)

/Volumes/Black/Developer/MNGA main*
❯ xcrun simctl list devices -j                      
{
  "devices" : {
    "com.apple.CoreSimulator.SimRuntime.iOS-26-0" : [
      {
        "dataPath" : "\/Users\/bugenzhao\/Library\/Developer\/CoreSimulator\/Devices\/87D5AFE2-5B9B-4CC1-8165-F7AC6F938E4D\/data",
        "dataPathSize" : 18337792,
        "logPath" : "\/Users\/bugenzhao\/Library\/Logs\/CoreSimulator\/87D5AFE2-5B9B-4CC1-8165-F7AC6F938E4D",
        "udid" : "87D5AFE2-5B9B-4CC1-8165-F7AC6F938E4D",
        "isAvailable" : true,
        "deviceTypeIdentifier" : "com.apple.CoreSimulator.SimDeviceType.iPhone-16-Pro",
        "state" : "Shutdown",
        "name" : "iPhone 16 Pro"
      },
      {
        "lastBootedAt" : "2025-09-16T16:37:26Z",
        "dataPath" : "\/Users\/bugenzhao\/Library\/Developer\/CoreSimulator\/Devices\/145C5916-A65C-4796-9A3B-45EC78F9548C\/data",
        "dataPathSize" : 1846296576,
        "logPath" : "\/Users\/bugenzhao\/Library\/Logs\/CoreSimulator\/145C5916-A65C-4796-9A3B-45EC78F9548C",
        "udid" : "145C5916-A65C-4796-9A3B-45EC78F9548C",
        "isAvailable" : true,
        "logPathSize" : 258048,
        "deviceTypeIdentifier" : "com.apple.CoreSimulator.SimDeviceType.iPad-Pro-11-inch-M4-8GB",
        "state" : "Shutdown",
        "name" : "iPad Pro 11-inch (M4)"
      }
    ]
  }
}

/Volumes/Black/Developer/MNGA main*
❯ xcrun simctl list devices   
== Devices ==
-- iOS 26.0 --
    iPhone 16 Pro (87D5AFE2-5B9B-4CC1-8165-F7AC6F938E4D) (Shutdown) 
    iPad Pro 11-inch (M4) (145C5916-A65C-4796-9A3B-45EC78F9548C) (Shutdown)

So I believe this is indeed a bug on Apple's side, even though Xcode is unaffected. Not sure if it's worthwhile adding to the FAQ.

[slowbrewedmacchiato]

Great news: the new Xcode 26.1 beta (17B5025f) fixes this issue.