macOS Catalina hibernatemode 25 invalid?

(MacBook Pro 13" 2020 w/ macOS 10.15.5) I've always set hibernatemode to 25 for all my old Mac's (running OS 10.10.5) without a problem. However, setting hibernatemode to 25 on Catalina didn't seem to work, even when I turned off the Standby feature as suggested in this link: https://apple.stackexchange.com/questions/352504/macos-mojave-hibernatemode-25-dark-wake-sleep-wake . Whenever I open the lid, I see the login screen immediately; apparently it did not wake from a hibernation state. I checked the "Wake from" Console history and it showed several "Wake from Deep Idle" events; none of them was "Wake from Hibernate". Is it possible to make Catalina hibernate?