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Thank you for submitting the bug report.
I was unable to reproduce the issue on latest RHEL 8 and further investigation didn't reveal any obvious problem with the module install process (all operations are performed on a copy of policy store, which is renamed upon success, making it the active policy store -- this should make the operation crash safe). That said, there have been significant changes in both SELinux and system kernel since RHEL 7.4.
I am now closing this bug, but if you where to encounter the issue again, please re-open.