tortoisegit asks for passphrase for git@host instead of using ssh-key

What steps will reproduce the problem?

1. clone repo, containing LFS objects via SSH
2. kill pageant process (or reboot)
3. git lfs prune (ensure, that following checkout needs to load objects from LFS server)
4. switch to/checkout other commit, which contains LFS objects not in local cache

What is the expected output? What do you see instead?

expected: ssh-agent asks for password

actual: tortoisegit asks for http-password for git@gitlabhost, this prompt must be canceled multiple times

What version of TortoiseGit and Git are you using? On what operating system?

• windows 10 1909
• git version 2.21.0.windows.1
• tortoisegit 2.11.0.0

Please provide any additional information below.

workaround:

1. fetch repo
2. provide password for ssh-key when asked
3. pageant ist now ready and checkout does not ask for password