This may be the issue as I'm using SunSSH:

Due to fork safety issues the application must re-login if the child continues to use the PKCS#11 engine.

Whether or not I'm affected by this, my issue does go away if I reconnect in the child prior to running the command.

Problem solved (for now).

In reply to Re: Forking and Net::SSH::Perl by eff_i_g
in thread Forking and Net::SSH::Perl by eff_i_g

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