We met same issue.
kernel Library Validation failed: Rejecting '/private/tmp/com.apple.installerDMqsdWnZ/MyPlugInName.bundle/Contents/MacOS/MyPlugInName' (Team ID: XXXXXX, platform: no) for process 'InstallerRemoteP(10235)' (Team ID: none, platform: yes), reason: mapping process is a platform binary, but mapped file is not.
JianAnWei
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I think this is the codesign validation issue of Installer.app. Apple should fix it their InstallerRemoteP codesign validation.
Here is what I see with my plugin:
kernel Library Validation failed: Rejecting '/private/tmp/com.apple.installerDMqsdWnZ/MyPlugInName.bundle/Contents/MacOS/MyPlugInName' (Team ID: XXXXXX, platform: no) for process 'InstallerRemoteP(10235)' (Team ID: none, platform: yes), reason: mapping process is a platform binary, but mapped file is not.