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As a workaround please do the following on all mailbox servers
zmlocalconfig -e zimbra_use_owasp_html_sanitizer=FALSE
It did help me. Unfortunately it means that their new owasp sanitizing framework is disabled (https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.12/P3). But it fixes both attachments and printing problems, i. e. it fixes both cases :
"Case 00850083 Upgrade from 8.8.12_P2 to 8.8.12_P3 breaks printing inline images"
"Case 00849909 Infinite attachement since 8.8.12P3 in mail window"
It also fixed some broken html messages in web client.
It corresponds to the following commit in the git : https://github.com/Zimbra/zm-mailbox/co ... ae79c9272a