Date and Time fields not capturing year value in the list view. The issue is seen only for some records, other records shows year value.
Release or Environment
The users who have "Compact list date/time" option enabled on the instance settings (Gear icon on top right of the home/navigation page) will experience this issue. This will compact the date display on the list and hides the year for the current year. This is the reason some fields from the past year shows full date format whereas the current year dates have missing 'year'.
Disable "Compact list date/time" option from instance settings to resolve the issue.