ssh-add -t does not work

[dcow]

"OpenSSH for Windows" version
7.7.2.1

Client OperatingSystem
Win10 19030

What is failing
When I try to add an identity to the ssh agent with a bounded lifetime, the operation fails. I have enabled and started the ssh-agent service. Adding and removing identities without a lifetime works:

PS> ssh-add
Enter passphrase for <~>/.ssh/id_ed25519:
Identity added: <~>/.ssh/id_ed25519 (dcow@shire) 
PS> ssh-add -l
256 SHA256:+Lo4sy0njfQmmHLX7k0Ws6aUHnfdVquGvRk0zkEP3TY dcow@shire (ED25519)
PS> ssh-add -d
Identity removed: <~>/.ssh/id_ed25519 (dcow@shire) 

Expected output

PS> ssh-add -t30s <~>\.ssh\id_ed25519'
Enter passphrase for <~>/.ssh/id_ed25519:
Identity added: <~>/.ssh/id_ed25519 (dcow@shire)
Lifetime set to 30 seconds

Actual output

PS> ssh-add -t30s <~>\.ssh\id_ed25519'
Enter passphrase for <~>/.ssh/id_ed25519:
Could not add identity "<~>\.ssh\id_ed25519": communication with agent failed

[anthonyvdotbe]

@dcow this is a duplicate of #1056