In session mode, when using the mTLS communication protocol, executing the getsystem command causes a certificate error in the returned session

Describe the bug In session mode, when using the mTLS communication protocol, executing the getsystem command causes a certificate error in the returned session

To Reproduce Steps to reproduce the behavior:

1. Go to 'session mode'
2. Command 1 'getsystem'
3. INFO[2026-06-10T21:54:47-04:00] [sliver/server/c2/mtls.go:143] Accepted incoming connection: 10.10.0.10:65150 ERRO[2026-06-10T21:54:47-04:00] [sliver/server/c2/mtls.go:223] Stream read error [mtls] unknown implant signature key ERRO[2026-06-10T21:54:47-04:00] [sliver/server/c2/mtls.go:203] yamux accept error: session shutdown

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [linux]
• Version [1.7.3]