"11.5 seems to have a problem that some shortcuts cannot be used."
Adobe made some changes to Japanese shortcuts in recent versions. (They almost never announce these changes.) You can download a table of all the current Japanese shortcuts from here:
Please let us know which one it is that stops working and which language you have selected.
--- Got your issue resolved? Please label the response as 'Correct Answer' to help your fellow community members find a solution to similar problems. ---