I had several invoices where the date column was there but all dates were blank even though I had entered dates for each line.

Changing templates/settings did not change this, and it was only happening on some invoices.

I found that I was able to “un-glitch” these invoices by changing each date, saving the invoice, changing the date back to what they should be, and saving again.

The dates display and print after doing this, but I haven’t to do it on each invoice.

Hope this helps someone, and I hope this helps the dev team narrow down a fix.