Syntax error in 'jsLoader.php' leads to inability to use the UI because jQuery cannot be read.

This issue has been reproducible on

• Chrome(77.0.3865.90)
• Firefox 67.0 (Win64)
  https://ftp.mozilla.org/pub/firefox/releases/67.0/

Please see the screenshot for more details.

Web browser released in 2019. May cause screen problems in Zabbix 6.0s if used without internet updates.

SyntaxError: fields are not currently supported
jsLoader.php:30015:8
SyntaxError: expected expression, got '?'
jsLoader.php:4795:40
> ReferenceError: jQuery is not defined
zabbix.php:414:1
> ReferenceError: jQuery is not defined
zabbix.php:415:1
> ReferenceError: jQuery is not defined
zabbix.php:419:2