Starting from today, you can issue wildcard certificates using a client that supports ACME v2 (acme.sh for example).
Some useful links:
LetsEncrypt is a non-profit organization, so they need a lot of support from the community. Consider to donate to them or become a sponsor if you're using LE in production.
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LetsEncrypt have revoked around 3 million certs last night due to a bug that they found. Are you impacted by this, Check out ?
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