Potential bug: Missing Output When Renewing Multiple Certificates

[Nitroxaddict]

Environment

• System: Synology NAS (DSM 7.2.2-72806 Update 3)
• acme.sh version: v3.1.0
• Certificate Authority: ZeroSSL (https://acme.zerossl.com/v2/DV90)
• Number of certificates: Multiple (2+)
• Execution method: Both manual terminal commands and scheduled tasks

Issue Description

When renewing multiple SSL certificates on a Synology NAS, acme.sh's renewal output progressively disappears over time:

1. First renewal: Full output for all certificates is visible
2. Second renewal: Partial output (only some certificates show renewal status)
3. Subsequent renewals: No output at all

This occurs whether running the command manually in terminal or via Task Scheduler, but only happens on systems with multiple certificates.

Reproduction Steps

1. Set up acme.sh with multiple certificates (I have 2 wildcard certs)
2. Run the renewal command:
   /usr/local/share/acme.sh/acme.sh --renew-all --deploy-hook synology_dsm --insecure
3. Run the same command several times in succession
4. Observe the renewal output gradually disappearing completely

Example Output

What I should receive (and do receive on my other NAS with a single certificate):
[Sun Mar 9 00:00:02 CET 2025] Renewing: '*.domain.com'
[Sun Mar 9 00:00:02 CET 2025] Renewing using Le_API=https://acme.zerossl.com/v2/DV90
[Sun Mar 9 00:00:02 CET 2025] Skipping. Next renewal time is: 2025-04-29T16:20:44Z
[Sun Mar 9 00:00:02 CET 2025] Add '--force' to force renewal.

What I receive after multiple renewals with multiple certificates:
[empty]

Impact

This bug makes it impossible to verify certificate renewal status, creating uncertainty about whether certificates are being properly maintained.

Comparison

I have two identical Synology NAS systems:

• NAS Centos #1: Single certificate → renewal output appears correctly in every execution
• NAS DEBUG不要写到脚本里面好吧 #2: Multiple certificates → renewal output progressively disappears

Both are using identical commands and configurations.

Test Results

• First time running the command: Full output for all certificates
• Second time: Partial output (only showed one of the certificates)
• Third and subsequent times: No output at all
• The certificates are still being checked/renewed correctly (verified by checking certificate expiry dates)

Additional Observations

• The problem only manifests on systems with multiple certificates
• The issue follows a consistent pattern: full output → partial output → no output
• The certificates themselves are being processed correctly despite the missing output

Any help identifying and resolving this renewal output issue would be greatly appreciated.

[Neilpang]

don't use --deploy-hook synology_dsm with --renew-all.
you can try like:

acme.sh  --renew-all  --debug 2

[Nitroxaddict]

The command works, it renews both certificates this isn't the issue. This issue is the output, which disappears completely after 3 runs of this command.
1st run I see the output for both certificates
2nd run I see the output for only one
3rd run there is not more output