Task description text becomes out of sync with bottom preview and hover tooltip

For some time, I've occasionally noticed a bug in Thunderbird where a task's description text is different depending on how its viewed. When a task is viewed in the lower pane or by double clicking it, the Description box contains old data. However, if the same task is hovered over with the cursor in the tasks list, the tooltip popup shows the current, up-to-date description data. If I cause the task to update server-side on my Nextcloud DAV server, then Thunderbird picks the update up correctly and all sources show the same data.

I'm not sure how to trigger this bug. Can anyone provide additional info?