A Spring Boot Application to Demonstrate Bug in Validation

Just upgraded Spring Boot from 2.1.4.RELEASE to 2.2.5.RELEASE and my application.yml doesn't validate any longer.

For example, in this yaml, the itemOne works in previous version but fails validation now.

test:
  items:
    itemOne:
      COLOR: RED
    ITEM2:
      COLOR: BLUE

It seems any nested map key with uppercase letters will fail. Tried to debug and found getName() in ValidationBindHandler mangles the key into

test.items[item-one].color
test.items[-i-t-e-m2].color

This is apparently incorrect.