Yes, we solved the problem, thank you very much.
The problem arises because Plesk has not released a new version of its own library yet.
LiteSpeed Extension Plesk Panel Extension v2.1.3 incompatible 18.0.69
Control Panel Plugin Downloads - LiteSpeed Technologies
Plesk Panel Extension v2.1.4 compatible 18.0.69
to install the plugin manually
How to install LiteSpeed Web Server with the Plesk control panel and the LiteSpeed Plesk extension.
docs.litespeedtech.com
panel.ini needs to be edited.
View attachment 28153
View attachment 28154