Wandering traders can sell pale oak saplings on worlds without Experimental Features toggled.
How to reproduce:
Enter a world that has the Winter Drop experiment disabled.
Spawn wandering traders by using spawn eggs or commands until you find one that can sell pale oak saplings.
Expected result:
Wandering traders would not be able to sell pale oak saplings when they're disabled.
Observed result:
Wandering traders can sell pale oak saplings even when they're disabled.
Can confirm