Enterprise Vault Compatibility Charts support table - P?

On the "Enterprise Vault Compatibility Charts" page (https://www.veritas.com/support/en_US/doc/128058600-128865835-0/v128056146-128865835) there is a "P" in the EV12 and EV14 columns describing support for Exchange 2016 CU21 and Exchange 2019 CU10. 

What does the letter "P" mean? Pass? Provisional?

Previously, a "Y" or "N" was used to denote whether or not it was supported, so the letter "P" is new and there doesn't appear to be a key to describe what it means. Please clarify - thanks