ExpectedConditions.or function not working as expected

I have to test an e-shop. The users can add items to their cart. When the cart is empty, a special section with id "empty-basket" is created. If the cart is not empty, this section's id becomes "basket".

These are my two selectors

@FindBy(how = How.ID, using = "#empty-basket")
private WebElement conteneur_panier_vide;

@FindBy(how = How.ID, using = "#basket")
private WebElement conteneur_panier_non_vide;

To check if the bloc containing the elements is well formed, I check if there is one of the sections described above. I use this piece of code to do so:

this.wait.until(
    ExpectedConditions.or(
        ExpectedConditions.visibilityOf(conteneur_panier_vide),
        ExpectedConditions.visibilityOf(conteneur_panier_non_vide)
    )
);

However, this gives me an error

org.openqa.selenium.TimeoutException: Expected condition failed: waiting for at least one condition to be valid

Surprised, I tried this:

this.wait.until(ExpectedConditions.visibilityOf(conteneur_panier_vide))

on a page with an empty basket. It works, the WebElement is found.

I then tried this:

this.wait.until(
    ExpectedConditions.or(
        ExpectedConditions.visibilityOf(conteneur_panier_vide),
    )
);

And it works as well. It means that adding a non-existing element to the 'or' breaks it, which is exactly the opposite of what it should be.

Does anyone have an idea of why my code is not working?