Hey, as Debian is already in freeze, the version of KDEPIM that will shipped with the next stable is 18.08.3. That was uploaded same days ago. There is no time to package 18.12.X sorry for that. So please test this version in more depth and report issues. If you also manage to point to existing bugfixes like done in #921535 it is very likely we can ship a that bugfix also for Buster.
hefee
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