JabRef 3.8.2
windows 10 10.0 amd64
Java 1.8.0_121

Steps to reproduce:

1. Create a new entry with "Pie{\'{n}}kowski, G." as author.
2. The author name is correctly displayed as Pieńkowski in the author column of the entry table. This was a fix for "\~" Escape Sequence Does Not Display Correctly in Entry Table #2458 introduced in JabRef 3.8.2
3. The author name, however, is NOT correctly displayed in the entry preview of the article. Instead it is shown as Pieʼnkowski, G.

Somewhat similar issues have been reported here:
#2458
#2460