A part of frame line of JComboBox lacks with HIDPI

FULL PRODUCT VERSION :
openjdk version "14-ea" 2020-03-17
OpenJDK Runtime Environment (build 14-ea+17-721)
OpenJDK 64-Bit Server VM (build 14-ea+17-721, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows Server 2012

A DESCRIPTION OF THE PROBLEM :
A bottom line of frame of JComboBox lacks if HIDPI is enabled.

"-Dsun.java2d.uiScale=1.5" option could also recreate the problem.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Change display mode to 150%
2. Launch SwingSet2 demo
> java -jar SwingSet2.jar
3. Change Look and Feel to "Windows Style Fook & Feel"
4. Move to ComboBox demo

EXPECTED VERSUS ACTUAL BEHAVIOR :
Expected:
Box frame appears around JComboBox.

Actual:
The bottom line of frame of the 3rd JComboBox is lacking.

REPRODUCIBILITY :
This bug can be reproduced always.