@Marsha7
Here is a couple of quotes from 2 different sections of the Help Centre information articles.
When I read them it appears that the new information clashes with the old information.
In the past it was my understanding that 48 hours after check out the pending charge automatically expired.
"Security deposits
If your listing requires a security deposit, you won’t be charged unless the host files a successful claim within 48 hours of your checkout.
If a host wants to make a claim on the security deposit, they must do so within 14 days of the checkout date or before a new guest checks in, whichever is earlier. If a claim is made, Airbnb will mediate and collect payment from the guest, as necessary.