I am encoutering the same problem with a universal iOS simulator version (18.5) Because the old version (18.5) is missing from this XML, Xcode and mobileassetd seem to have lost track of it entirely. I managed to get Xcode to recognise it, but Xcode chooses to soft delete instead of ing the disk. Running scan-and-mount identifies the orphan simulator: > xcrun simctl runtime scan-and-mount > xcrun simctl runtime list == Disk Images == -- iOS -- iOS 26.2 (23C54) - E2B78652-EDF6-450D-BC2C-2F0B11B3AD95 (Ready) -- unknown -- <unknown platform> - CE40DFD4-ACAC-4A6B-975A-51148DA604B0 (Verifying) Total Disk Images: 2 (7.8G) [Note: 1 image(s) are of unknown size] > xcrun simctl runtime list == Disk Images == -- iOS -- iOS 18.5 (22F77) - CE40DFD4-ACAC-4A6B-975A-51148DA604B0 (Ready) iOS 26.2 (23C54) - E2B78652-EDF6-450D-BC2C-2F0B11B3AD95 (Ready) Total Disk Images: 2 (7.8G) [Note: 1 image(s) are of unknown size] Then I tried to directly delete the simulator: > xcrun simctl runtime delete 22F77 > xcrun simctl runtime list == Disk Images == -- iOS -- iOS 18.5 (22F77) - CE40DFD4-ACAC-4A6B-975A-51148DA604B0 (Deleting) iOS 26.2 (23C54) - E2B78652-EDF6-450D-BC2C-2F0B11B3AD95 (Ready) Total Disk Images: 2 (7.8G) [Note: 1 image(s) are of unknown size] > xcrun simctl runtime list == Disk Images == -- iOS -- iOS 26.2 (23C54) - E2B78652-EDF6-450D-BC2C-2F0B11B3AD95 (Ready) Total Disk Images: 1 (7.8G) simctl lied and the simulator is still there: > ls -lah System/Volumes/Data/System/Library/AssetsV2/com_apple_MobileAsset_iOSSimulatorRuntime/ Permissions Size User Date Modified Name drwxr-xr-x@ - _nsurlsessiond 7 Jun 2025  c0d3fd05106683ba0b3680d4d1afec65f098d700.asset drwxr-xr-x@ - _nsurlsessiond 25 Jan 17:43  e4478b4b9014ff28fe3c265daca488f55a284f4c.asset .rw-r--r-- 2.0k root 25 Jan 17:48 󰗀 com_apple_MobileAsset_iOSSimulatorRuntime.xml .rw-r--r-- 3.6k root 25 Jan 17:29  com_apple_MobileAsset_iOSSimulatorRuntime.xml.purged The Info.plist of simulator iOS26.2 and iOS18.5 is identical (except iOS26.2 has a Architectures property). Both have __AssetDefaultGarbageCollectionBehavior=NeverCollected. So I dont think that is the problem. Also in my case, /System/Library/AssetsV2/com_apple_MobileAsset_iOSSimulatorRuntime.xml actually only shows the iOS18.5 simulator: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>AssetType</key> <string>com.apple.MobileAsset.iOSSimulatorRuntime</string> <key>Assets</key> <array> <dict> <key>ArchiveDecryptionKey</key> <string>15wwfkrSon24ww9+9QlQlGA2R0LtJhwI7kTTmiYCUNk=</string> <key>ArchiveID</key> <string>HIxuIFG8vmJvbIM/soIBLz64wFaDOd9Iup1ZYAv1CrA=</string> <key>AssetFormat</key> <string>AppleArchive</string> <key>AssetType</key> <string>com.apple.MobileAsset.iOSSimulatorRuntime</string> <key>Build</key> <string>22F77</string> <key>Ramp</key> <false/> <key>SimulatorVersion</key> <string>18.5</string> <key>_CompressionAlgorithm</key> <string>AppleArchive</string> <key>_DownloadSize</key> <integer>8858370048</integer> <key>_Measurement</key> <data> BoX4n0866stvYXjfzb5FUKKXySs= </data> <key>_Measurement-SHA256</key> <data> gCkk0Tyi9WSI6cd8kOOYgg5X0rINR9qLGx+g1mfNnNg= </data> <key>_MeasurementAlgorithm</key> <string>SHA-1</string> <key>_UnarchivedSize</key> <integer>9128947712</integer> <key>__AssetDefaultGarbageCollectionBehavior</key> <string>NeverCollected</string> <key>__BaseURL</key> <string>https://updates.cdn-apple.com/2025/mobileassets/043-39934/7E9105AB-C0A9-4842-9F83-51647042E3BF/</string> <key>__CanUseLocalCacheServer</key> <true/> <key>__RelativePath</key> <string>com_apple_MobileAsset_iOSSimulatorRuntime/1DDBFF7D-AF07-4905-B63C-25AE53C4702A.aar</string> <key>__override_dupe__</key> <true/> </dict> </array> <key>CachedAssetSetId</key> <string>91c08968-dff6-4825-bf38-a3aee7ca42ac</string> <key>DownloadedFromLive</key> <string>https://gdmf.apple.com/v2/assets</string> <key>catalogInfo</key> <dict> <key>isLiveServer</key> <true/> </dict> <key>lastTimeChecked</key> <date>2026-01-25T09:48:51Z</date> <key>postedDate</key> <date>2025-05-15T00:00:00Z</date> </dict> </plist> The one thing that stands out is that minutes after running scan-and-mount, the simctl still cannot identify the size of the iOS18.5 image: > xcrun simctl runtime list == Disk Images == -- iOS -- iOS 26.2 (23C54) - E2B78652-EDF6-450D-BC2C-2F0B11B3AD95 (Ready) iOS 18.5 (22F77) - A053B276-E553-48EE-86EC-FEACB14A4ED9 (Ready) Total Disk Images: 2 (7.8G) [Note: 1 image(s) are of unknown size]

Facing the same problem