XP0 Custom build - empty keys value in connectionstring.config on CM

I have developed a custom Sitecore module for Stream. I have followed the appropriate installation procedures and details, but I noticed that the connectionstring.config file contains empty values, including my connection string for Stream.

<?xml version="1.0" encoding="utf-8"?>
<connectionStrings configBuilders="SitecoreConnectionStringsBuilder">
  <!-- 
    Sitecore connection strings.
    All database connections for Sitecore are configured here.
  -->
  <add name="core" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_Core"/>
  <add name="security" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_Security"/>
  <add name="master" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_Master"/>
  <add name="web" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_Web"/>
  <add name="messaging" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore.Messaging"/>
  <add name="xdb.processing.pools" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_Processing.Pools"/>
  <add name="xdb.referencedata" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_ReferenceData"/>
  <add name="xdb.processing.tasks" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_Processing.Tasks"/>
  <add name="experienceforms" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_ExperienceForms"/>
  <add name="exm.master" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_EXM.Master"/>
  <add name="reporting" connectionString="user id=user;password=password;Data Source=(server);Database=Sitecore_Analytics"/>
  <add name="cortex.processing.engine" connectionString="https://Sitecore_xconnect"/>
  <add name="cortex.processing.engine.client.certificate" connectionString="StoreName=My;StoreLocation=CurrentUser;FindType=FindByThumbprint;FindValue="/>
  <add name="sitecore.reporting.client" connectionString="https://Sitecore_xconnect"/>
  <add name="sitecore.reporting.client.certificate" connectionString="StoreName=My;StoreLocation=CurrentUser;FindType=FindByThumbprint;FindValue="/>
  <add name="solr.search" connectionString="https://localhost:8993/solr"/>
  <add name="sitecoreidentity.secret" connectionString="Set client secret for Sitecore Identity server here."/>
  <add name="xconnect.collection" connectionString="https://Sitecore_xconnect"/>
  <add name="xconnect.collection.certificate" connectionString="StoreName=My;StoreLocation=CurrentUser;FindType=FindByThumbprint;FindValue="/>
  <add name="xdb.marketingautomation.operations.client" connectionString="https://Sitecore_xconnect"/>
  <add name="xdb.marketingautomation.operations.client.certificate"
  	connectionString="StoreName=My;StoreLocation=CurrentUser;FindType=FindByThumbprint;FindValue="/>
  <add name="xdb.marketingautomation.reporting.client" connectionString="https://Sitecore_xconnect"/>
  <add name="xdb.marketingautomation.reporting.client.certificate"
  	connectionString="StoreName=My;StoreLocation=CurrentUser;FindType=FindByThumbprint;FindValue="/>
  <add name="xdb.referencedata.client" connectionString="https://Sitecore_xconnect"/>
  <add name="xdb.referencedata.client.certificate" connectionString="StoreName=My;StoreLocation=CurrentUser;FindType=FindByThumbprint;FindValue="/>
  <add name="EXM.CryptographicKey" connectionString="0x0000000000000000000000000000000000000000000000000000000000000000"/>
  <add name="EXM.AuthenticationKey" connectionString="0x0000000000000000000000000000000000000000000000000000000000000000"/>
  <add name="sitecore.aiclient.stream" connectionString="${Sitecore_ConnectionStrings_sitecore.aiclient.stream}"/>
</connectionStrings>

Start with the CM role's connectionstring.config and the sitecore.aiclient.stream entry shown in the report. Reproduce the XP0 custom build using the described installation procedure, then trace how the custom Sitecore module supplies that value. Done means the generated configuration contains the expected Stream connection string instead of an empty value.