Any non living entities can not be found with entity selectors using the team criteria.
How to replicate: Summon a non living entity like a minecart or boat and add it to a team. Now try to find this entity using the team criteria.

/execute as @e[team=exampleTeam] run say hello

replace exampleTeam with the name of your team.

This command will not find the non living entities while players and other living entities can be found.