Installer plugin not working on beta macOS Big Sur

We have an installer package (.pkg) file which has an installer plugin. The package is signed and notarized. But pane for this plugin not getting loaded when the package is run on MacOS11 Big Sur. This step is not shown on the left pane where installer steps are listed. Same is working in 10.15 Catalina.

We are getting error log in console:
/var/folders/jr/c33ck8t95hb98tyhss4n7c980000gn/T/com.apple.install.GoVVGzNX/{pluginname}.bundle/Contents/MacOS/{pluginname}: dlopen(/var/folders/jr/c33ck8t95hb98tyhss4n7c980000gn/T/com.apple.install.GoVVGzNX/{pluginname}.bundle/Contents/MacOS/{pluginname}, 0x0109): code signature in (/private/var/folders/jr/c33ck8t95hb98tyhss4n7c980000gn/T/com.apple.install.GoVVGzNX/{pluginname}.bundle/Contents/MacOS/{pluginname}) not valid for use in process: mapping process is a platform binary, but mapped file is not

Is there any specific way of signing the plugin using signing certificate like using Mac Developer, Apple Developer, Developer ID Application, Developer ID Installer, etc ?

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.
Installer plugin not working on beta macOS Big Sur
 
 
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