The bug

The team color is not used for the advanced tooltips entity name hover event.

How to reproduce

1. Summon a pig with a colored name

   /summon pig ~ ~ ~ {CustomName:"{\"text\":\"test\",\"color\":\"red\"}"}
   

2. Create a team with a team color

   /team add blueTeam
   /team modify blueTeam color blue
   /team join blueTeam @e[type=pig]
   

3. Make sure advanced tooltips are active (F3 + H)
4. Have the name of the pig be displayed in chat and hover over it

   /say @e[type=pig]
   

   → The name in the hover event is red