The bug

The command feedback of the /tag <targets> list command says "tags" even if the target has only one. Same for the summary in case <targets> matches multiple entities. Expected would be "tag(s)" instead.

How to reproduce

1. Use the following command

   /tag @s add test
   

   → "Added tag 'test' to <target>"

2. Use the following command

   /tag @s list
   

   → "<targets> has 1 tags: test"

Respectively "The <count> entities have 1 total tags: test"