When providing non-zero lease ID: etcdctl returns nothing for GET of key PUT using custom C++ API (using v3) that can GET and PUT

[48656c6c6f]

I'm trying to use etcdctl to get a key that is put using a custom application interacting with the v3 API. The custom application, written in C++, can PUT and GET the key/value pair, but etcdctl simply returns with no output. Using only etcdctl, I am able to PUT and GET key/value pairs. The C++ API using a int64_t for the lease ID, while etcdctl uses hex -- could that have something do do with the problem?

Weirdly, a PUT with etcdctl is readable with a GET from the C++ API.

Interestingly, when I provide 0 as the lease ID for the PUT from the C++ API, etcdctl is able to GET the k/v pair. What's up with lease ID that could cause this?

example key/value pair:
members/192.168.0.100, ""

etcdctl version: 3.5.10
API version.: 3.5