Japanese font is shown as squares on text console if RHEL8.0 is installed in Japanese

Issue

When RHEL8.0 is installed in Japanese, default LANG is set to
en_US.UTF-8 on text console, but standard output displayed in Japanese.

This problem does not occur on RHEL7.6.

How to reproduce (for example)

1. Start installing RHEL8 GA by virt-manager

2. Choose Japanese as a Language  during installing

3. Reboot after finishing installing RHEL8

4. Open a console of the RHEL8 machine on virt-manager

5. Run a none-exists command

# hoge

6. You can see character corruption.

# hoge
-bash: hoge ■ ■ ■ ■ ■ ■