Precondition: only Zabbix 5.0

Steps to reproduce:

• Create two templates test1 and test2
• Select template test1 and press the 'Mass update' button
• Select 'Linked templates' tab
• Link template test2

Result: Error appears 'Field "linked_templates" is not correct: invalid data type.'

Payload form data:

sid{SID}&action=template.massupdate&templates%5B10442%5D=10442&visible%5Blinked_templates%5D=1&mass_action_tpls=0&linked_templates%5B%5D=10443&masssave=Update

Expected: Template successfully linked.

Note: the same issue for replace and unlink scenario.