Story subtasks disappear instead of getting struck out when marked done or closed in activity timeline ?

[Galxyz Administrator]

We are using activity timeline integration with JIRA to manage our agile scrum board and sprints and we have noticed a weird issue that is very problematic. Story Subtasks, instead of getting struck out disappear when marked done or closed. Task and Epic subtasks work just fine and get struck out when marked done or closed but story subtasks disappear instead of getting struck out? Any ideas?! Thanks!

[Nic Brough -Adaptavist-]

What, exactly, does the board filter say?  And what do you have for the board's column configuration?  (Specifically, are all the status mapped into columns - the thought there is that your subtasks are going into a status that is not on the board)