Certes.AcmeException: Can not find issuer 'C=US,O=Internet Security Research Group,CN=ISRG Root X1' for certificate 'C=US,O=Let's Encrypt,CN=R3'

I don't know if it is relevant to mention, but in the Chain incomplete since feb 8 2024 I did not assume that the third certificate was a root certificate. I was well aware that it was the cross-signed cert,

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