Removed Neeko but didn't lose its Trait bonuses

As you can see in the gif, I had a Maokai, Ivern and Neeko, giving me 3/2 for Druid and 3/3 for Woodland. I then swapped my Neeko with a Mundo from my bench, but i did not lose the trait buffs (it still said i had 3 druid and 3 woodland unit). And in the following matches the woodland synergy went off duplicating my maokai or ivern.