ADDITIONAL SYSTEM INFORMATION :
Bug occurs even in openjdk 14

A DESCRIPTION OF THE PROBLEM :
https://bugs.openjdk.java.net/browse/JDK-8075939
This bug still happens if you replace .findFirst().get() with .iterator().next().

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Take the test case in the description of the ticket here: https://bugs.openjdk.java.net/browse/JDK-8075939
replace .findFirst().get() with .iterator().next()



FREQUENCY : always