caffeine: Does caffeine cache return inconsistent result?

I am currently experiencing an issue where I save $['names'][*] in caffeine cache and the value retrieved from the cache is $['names']. This issue seems to be intermittent. I debugged to the point where the data being saved in the cache and I saw that the correct value is being put in the cache while an incorrect value is being retrieved for some reasons.

I am using Spring boot version 2.2.5 and I have tried several versions of caffeine cache from 2.8.3 upwards.