The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.
3.10.12-1~22.04.163.12.3-1ubuntu0.153.13.3-13.13.3-23.13.3-43.13.4-13.13.5-13.13.5-23.13.6-13.13.7-13.13.7-1ubuntu0.13.13.7-1ubuntu0.2+2 more3.14.0-13.14.0-1ubuntu0.13.14.0-1ubuntu0.23.14.0-1ubuntu0.33.14.0~a7-0ubuntu13.14.0~b1-13.14.0~b3-13.14.0~rc1-13.14.0~rc2-13.14.0~rc3-13.8.0-3ubuntu1~18.04.23.8.0-3ubuntu1~18.04.2+esm13.8.0-3ubuntu1~18.04.2+esm103.8.0-3ubuntu1~18.04.2+esm113.8.0-3ubuntu1~18.04.2+esm23.8.0-3ubuntu1~18.04.2+esm33.8.0-3ubuntu1~18.04.2+esm43.8.0-3ubuntu1~18.04.2+esm53.8.0-3ubuntu1~18.04.2+esm63.8.0-3ubuntu1~18.04.2+esm7+4 more3.8.0-13.8.0-23.8.0-33.8.0-43.8.0-53.8.1-2ubuntu33.8.10-0ubuntu1~20.043.8.10-0ubuntu1~20.04.13.8.10-0ubuntu1~20.04.103.8.10-0ubuntu1~20.04.11+29 more3.9.0-5~20.043.9.0~rc1-1~20.043.9.5-3ubuntu0~20.04.13.9.5-3ubuntu0~20.04.1+esm13.9.5-3ubuntu0~20.04.1+esm103.9.5-3ubuntu0~20.04.1+esm113.9.5-3ubuntu0~20.04.1+esm23.9.5-3ubuntu0~20.04.1+esm33.9.5-3ubuntu0~20.04.1+esm43.9.5-3ubuntu0~20.04.1+esm5+5 more3.11.0~rc1-1~22.043.11.0~rc1-1~22.04.13.11.0~rc1-1~22.04.1+esm13.11.0~rc1-1~22.04.1+esm23.11.0~rc1-1~22.04.1~esm13.11.0~rc1-1~22.04.1~esm23.11.0~rc1-1~22.04.1~esm33.11.0~rc1-1~22.04.1~esm43.11.0~rc1-1~22.04.1~esm53.11.0~rc1-1~22.04.1~esm6+3 moreExploitability
AV:LAC:LAT:PPR:LUI:NVulnerable System
VC:NVI:HVA:NSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N