Use the attached configuration file to reproduce.
click on cache container -> configuration -> templates -> add new template -> set name newTemplate and base configuration: replicatedCacheAsTemplate -> click create

Result:
There is an error pop up with empty message "{}"
The template is created but the configuration is not copied.

Note: I'm not sure which part of replicatedCacheAsTemplate configuration is causing this issue, but it's not happening with every template.