The cell cache incorrectly records partially-cached cells, something that was introduced in kopanocore-8.6.80-869-gc0b1f0794 .
1. Grow a property beyond 32K, e.g. the rules table to 32788 bytes: for ((i = 0; i < 600; ++i)); do kopano-ibrule -u foo -A; done. Because this is a write operation, the cell cache contains the rule table and will be handed out correctly when printed now.
2. kopano-srvadm --clear-cache=cell
3. kopano-ibrule -u foo -S: inbox object is sourced from DB and table is printed.
4. kopano-ibrule -u foo -S: inbox object is sourced from cache and table is not printed.