I have a node 'n' with a reminder (so related to Time Management).
when I create a sibling node for this node 'n', all the ancestors until the root node inherit of the "reminder " icon (the clock png).
For the moment I use the following work around : I create a new sibling node for the node "n" , that I directly delete, then the "reminder" icon disappears on all the ancestors nodes.
Preview 1.9.14_01