I was just drafting a post to say the same thing!
1 - Create an offline list and call it TEST.
2 - Go to Live view, select a cache, select ..., select "Add to Offline List", and select "TEST".
3 - Return to Offline Lists, select TEST, select the newly added cache, and select ... ; At this point, there is NOT an option to "View on geocaching.com"
4 - But there is an option to "Refresh", so select that one. Sometimes, there is still NOT an option to "View on geocaching.com"
5 - Select "Refresh" a second time. Now the option to "View on geocaching.com" appears.