Hello,
I have an Vserver with CentOS Linux 7.9.2009 (Core) and Plesk Onyx Version 17.5.3 . I tried to install php 7.4 over SSH. When I call up php -v, I also get version 7.4.20.
In Plesk I only get version 7.2.34. and I have now looked at the paths and found that version 7.4 is not installed...