Windows SSH agent + WSL2 Git: 1Password SSH prompt appears but commit remains unsigned

I am trying to setup Git commit signing with SSH inside WSL2. I followed all the instructions for setting up 1Password SSH in WSL, and I can use my keys in 1Password totally fine using ssh.exe directly. I also followed the Git signing with SSH instructions, however my commits are not getting signed.

When I commit with -S, 1Password shows me the authorization prompt, and I accept it, but still my commits remain unsigned. I am using:
* Windows 11 (build 22621.2861)
* 1Password for Windows 8.10.22 (81022040)
* SSH OpenSSH_for_Windows_8.6p1, LibreSSL 3.4.3.
* WSL 2.0.9.0
* (Linux) Git 2.34.1

To recap:
* In WSL, ssh.exe -T git@git.sr.ht successfully shows me the 1Password SSH key auth prompt, and when I accept it, I am authenticated to git.sr.ht OK.
* I have configured Git according to the "Configure Git Commit Signing" button in 1Password with "Configure for Windows Subsystem for Linux" checked, using the same SSH key as above
* I double checked that gpg.ssh.program points to op-ssh-sign-wsl, that gpg.format is ssh, and that core.sshCommand is set to ssh.exe
* git commit -m 'testing' -S shows the 1Password SSH prompt same as above, and when I accept, the commit succeeds
* git log --show-signature says "No signature" on the commit if gpg.ssh.allowedSignersFile is unset, and says "Could not verify signature." if it is set to my (populated) signers file.
* I pushed one of these commits to a forge and pulled it on another machine which confirmed that the commit in fact has no signature.

Am I doing something wrong? Any help would be greatly appreciated!

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1Password Version: 8.10.22
Extension Version: Not Provided
OS Version: Windows 11 (build 22621.2861)
Browser: Not Provided