In referencing completed JIRA issues through comments it can be helpful to see that they are complete, but the use of strike through makes it confusing. Strike through generally means that the text is incorrect, removed, or should be deleted. Is it possible to use something else? I'd like to see a graphical check mark if possible, but I'm open to other indicators. Strike through just looks awkward.
For example: We need to deliver PROJ-123, PROJ-456 and PROJ-789 to our customer when they are all completed.
From the example it looks like PROJ-123 and PROJ-789 were incorrect and shouldn't have been listed.
It's not just my opinion on the use of strike through. Many sites define it the same way. Below is one of them.
Definition: