Browser app integration broken when using 1Password for Windows

Likewise for me with Vivaldi Snapshot 6.1.3035.3 (Official Build) (64-bit) and browser extension 2.11.1 from the Chrome Web Store attempting to establish a connection to 1Password Nightly for Windows 8.10.8 (81008002). This behavior (or more accurately, lack of functionality) is present both on Windows 11 Pro Insider Preview 22H2 Build 23440.1000 and Kubuntu 23.04 "The Lunar Lobster" using Linux kernel 6.2.0-23-generic. The relevant content of the BrowserSupport log is:

INFO [1P:native-messaging\op-browser-support\src\main.rs:165] Starting 1Password-BrowserSupport 8.10.8-2.NIGHTLY production build no. 81008002.
INFO [1P:native-messaging\op-browser-support\src\browser_verification\windows.rs:42] Verifying browser "C:\Windows\System32\cmd.exe"
ERROR [1P:native-messaging\op-browser-support\src\browser_verification\windows.rs:49] WinApi(Cannot find the requested object.)
INFO [1P:native-messaging\op-browser-support\src\browser_verification\windows.rs:59] name: cmd, publisher: Unknown Publisher, pid: 5604, version: 10.0.23440.1000
INFO [1P:native-messaging\op-browser-support\src\browser_verification\windows.rs:42] Verifying browser "C:\Program Files\Vivaldi\Application\vivaldi.exe"
INFO [1P:native-messaging\op-browser-support\src\browser_verification\windows.rs:59] name: vivaldi, publisher: Vivaldi Technologies AS, pid: 21748, version: 6.1.3035.3
ERROR [1P:native-messaging\op-browser-support\src\main.rs:197] Browser support error: ParentVerificationFail(WinApi(The timestamp signature and/or certificate could not be verified or is malformed.)), happened in: native-messaging\op-browser-support\src\browser_verification\windows.rs:79
Additional error context: Browser's certificate is not trusted