What are all the scenarios when ConfigServerCatalogCacheLoader refreshes meta data

in mongodb i have 3 config servers . config-svr-0 is primary. Now if config-svr-0 is down and config-svr-1 becomes primary, does the configCacheLoader refresh all meta data in config-svr-1?
I see in config-svr-1 the below log:
I SH_REFR [ConfigServerCatalogCacheLoader-13464] Refresh for collection mycoll took 0 ms.

Does this always happen? i expect that as data is replicated between config-svr-0 and config-svr-1, what’s the need to refresh meta data?