(This glitch also applies to 1.13, 1.14, 1.15, 1.16, but it only let me choose 1.16.1)

You cannot set a teams prefix/suffix to a scoreboard objective or a selector

For example, running /team modify test suffix {"selector":"@p","color":"gold"}

Would set test's suffix to "@p" instead of the nearest entity

Another example, running /team modify test suffix 
["",{"text":"$","color":"yellow"},{"score":

,"color":"yellow"}]
 Would set test's suffix to just "$", instead of "$(money)"