Broken ACME? (unable to renew certs)

Hi guys.

I'm trying to renew my certs but ACME times out:

 ...
[Sat Dec  3 16:13:38 CET 2022] Processing, The CA is processing your order, please just wait. (26/30)
[Sat Dec  3 16:14:01 CET 2022] mail.work:Timeout
[Sat Dec  3 16:14:01 CET 2022] Please check log file for more details: /var/log/acme.log

and there is something in the log what makes me wonder if it is a "bug"

...
[Sat Dec  3 16:13:58 CET 2022] _WGET='wget -q --content-on-error '
[Sat Dec  3 16:14:00 CET 2022] No -i support in sed
[Sat Dec  3 16:14:00 CET 2022] _ret='0'
[Sat Dec  3 16:14:01 CET 2022] _hcode='0'
[Sat Dec  3 16:14:01 CET 2022] code='200'
[Sat Dec  3 16:14:01 CET 2022] mail.work:Timeout
[Sat Dec  3 16:14:01 CET 2022] pid
[Sat Dec  3 16:14:01 CET 2022] No need to restore nginx, skip.
[Sat Dec  3 16:14:01 CET 2022] _clearupdns
[Sat Dec  3 16:14:01 CET 2022] dns_entries
[Sat Dec  3 16:14:01 CET 2022] skip dns.
[Sat Dec  3 16:14:01 CET 2022] _on_issue_err
[Sat Dec  3 16:14:01 CET 2022] Please check log file for more details: /var/log/acme.log
[Sat Dec  3 16:14:01 CET 2022] url='https://acme.zerossl.com/v2/DV90/chall/sRZzh'
[Sat Dec  3 16:14:01 CET 2022] payload='{}'
[Sat Dec  3 16:14:01 CET 2022] Retrying post
[Sat Dec  3 16:14:01 CET 2022] POST
[Sat Dec  3 16:14:01 CET 2022] _post_url='https://acme.zerossl.com/v2/DV90/cha....'

Any & all suggestion are much appreciated.
thanks, L.

this might be related to (busybox?) sed, instead of the proper one, if there's one.