I also wonder.. could my issue potentially be related to using the default driver that Spring Boot’s project generator uses? We’ve been using it with no issues for at least a couple years now.

      <dependency>
        <groupId>com.ibm.db2</groupId>
        <artifactId>jcc</artifactId>
        <version>11.5.8.0</version>
      </dependency>

Would make sense.. since LUW does not have the Application Compatibility feature. Will try switching to the driver teams used to use.