Enable opcache php 8.0.7 (OLS 1.7.11)

Is there a trick to enabling Zend Opcache with PHP8 ?
the moment I uncomment the zend_extension line in php.ini I get 503

2021-10-01 16:44:03.920805 [NOTICE] [873781] sendKillCmdToWatchdog: 'extappkill:873819:-3:0'.
2021-10-01 16:44:03.920828 [NOTICE] [873778] Cmd from child: [extappkill:873819:-3:0]
2021-10-01 16:44:03.920848 [NOTICE] [873781] [] oops! 503 Service Unavailable
Thanks in advance
Thank @Cold-Egg I was running in an Arch Linux environment with the openlitespeed-bin from the AUR but have since redone the server to Ubuntu which has easier access to the APT packages.