Multiselects shows wrong display values in overviews

[MrGeneration]

Infos:

• Used Zammad version: develop / (5.1)
• Installation method (source, package, ..): any
• Operating system: any
• Database + version: any
• Elasticsearch version: any
• Browser + version: verified on Opera v83 (Chromium based)
• Ticket: #10100820

Expected behavior:

No matter if you select a set of values or a single one - overviews will show a ; seperated string with all display values selected.

Actual behavior:

Multiselects display [Object Object] if you either select a single value or two following values.
Multiselects displays key values if you select two not following values.
Both in overviews.

Screens of the different shown tickets (in order of sorting):

Steps to reproduce the behavior:

• add a multiselect field with at least 3 options
  • to differentiate better make sure to have your keys differ from display options
• apply to database
• have a ticket or two where you select several varioations of your values
• enable the multiselect column in any overview and check it's content

Yes I'm sure this is a bug and no feature request or a general question.