Bug description
if you give yourself a command block ( /give @s command_block )
then you place it and type /identity unequip
selector can obviously be anything like @A @s @p @e @r or a player name
then when you use the command block it gives a type of error "An unexpected error has occurred trying to execute that command"

What do you get in the tooltip when you hover over the "An unexpected error has occurred trying to execute that command" error message?

None

What do you get in the tooltip when you hover over the "An unexpected error has occurred trying to execute that command" error message?