Ok, I'll proceed sending the errors that I've detected from this issue:
PHP version: 5.6
About Osticket -> Log entry -> none

Console Jquery error when Save is clicked:
jquery-3.4.0.min.js?a076918:2 Uncaught Error: Syntax error, unrecognized expression: a[href=#config]
at Function.se.error (jquery-3.4.0.min.js?a076918:2)
at se.tokenize (jquery-3.4.0.min.js?a076918:2)
at se.select (jquery-3.4.0.min.js?a076918:2)
at Function.se [as find] (jquery-3.4.0.min.js?a076918:2)
at k.fn.init.find (jquery-3.4.0.min.js?a076918:2)
at new k.fn.init (jquery-3.4.0.min.js?a076918:2)
at k (jquery-3.4.0.min.js?a076918:2)
at HTMLDivElement.<anonymous> (scp.js?a076918:744)
at Function.each (jquery-3.4.0.min.js?a076918:2)
at k.fn.init.each (jquery-3.4.0.min.js?a076918:2)
From PHP logs -> none