Reopening topicmap with pinned note sometimes produces display error.
When I arrange pinned note on a topicmap, then leave the topicmap and come back later, I sometimes see this effect: The note is pinned, but behind it I see parts of the the same item as if it wasn't pinned.
I don't see any errors neither in the dmx.log nor in the browser console. (I am using Firefox 73 on Ubuntu but Chromium shows the same behaviour.)
An example where it happens: https://demo.dmx.systems/systems.dmx.webclient/#/topicmap/8532 ("About the Topicmap...")
What other information do you need to debug this?