Portals clear score of non player entities

Scores for non player entities are cleared as them pass through portals, no matter thay are Nether Portals or End Portals.
To reproduce it:
Prepare a Nether Portal or a End Portal, an objective of any kind and a non player entity (for example, a cow).
Set a score for the entity and make it pass through the portal.
Use a command such as /scoreboard players get or something else to get the score.
You will find that none is set for the objective