Bad connection not being released from pool

[akg1]

Environment

Knex version: ^3.1.0
Database + version: AWS RDS PostgreSQL 16.2
OS: 20.11-alpine container

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Bug

1. Explain what kind of behaviour you are getting and how you think it should do

This is a bit complicated to debug, but as far as I can tell, we're see an issue where we get a server conn crashed from PgBouncer, and subsequently, queries on our containers start failing with: Client has encountered a connection error and is not queryable. My best guess is that the connection is remaining in the pool. I don't know how to debug this further though.

3. Error message

Initial error:

error: /* query text here */ - server conn crashed?
    at Object.queryBuilder (/app/node_modules/knex/lib/knex-builder/make-knex.js:112:26)
    at Function.value (/app/node_modules/knex/lib/knex-builder/make-knex.js:92:29)
    at Function.withSchema (/app/node_modules/knex/lib/knex-builder/make-knex.js:270:28)
    at DbEntityGateway.shardQueryBuilderHelper (/app/packages/api/src/data/DbEntityGateway.ts:1067:26)
    at ctx (/app/packages/api/src/data/DbEntityGateway.ts:1363:12)
    at /app/packages/api/src/data/implementations/GroupsImpl.ts:1907:21
    at /app/node_modules/p-limit/index.js:23:31
    at run (/app/node_modules/p-limit/index.js:23:43)
    at /app/node_modules/p-limit/index.js:45:2"

Subsequent errors:

Client has encountered a connection error and is not queryable (no real stack)

4. Reduced test code, for example in https://npm.runkit.com/knex or if it needs real
   database connection to MySQL or PostgreSQL, then single file example which initializes
   needed data and demonstrates the problem.