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

[juemingf]

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
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Desktop (please complete the following information):

• OS: [linux]
• Version [1.7.3]