"Not connected to any bucket" / NO_BUCKET error on insert

Summary: When trying to insert data into a bucket, operations fails (when using 2.7.19)

Repro:

1. See attached code for barebones example.
2. Debug to bucket.Insert
3. View response.Success

Expected:

response.Success is true, and document is inserted.

Actual:

response.Success is false.

document is not inserted

message is KV Error: {Name="NO_BUCKET", Description="Not connected to any bucket", Attributes="conn-state-invalidated"}

Notes:

I tried the exact same code with 2.7.18, and it works as expected.

Log output is attached. Code attached.