Describe the bug

When an ApplicationLoadBalancer routing.http2.enabled attribute is modified from "false" to "true" CDK will remove the attribute with the expectation that "true" will be the default. CloudFormation does not remove the attribute nor does it set the attribute value back to default.

Regression Issue

• Select this option if this issue appears to be a regression.

Last Known Working CDK Version

No response

Expected Behavior

Modifying the attribute value from "false" to "true" modifies the load balancer attribute from "false" to "true"

Current Behavior

Value remains "false" despite the attribute being removed.

Reproduction Steps

New instance of load balancer, http2.enabled set to false; deploy
Modify http2 from false to true; deploy

Possible Solution

When http2 is not undefined, reflect string value

Additional Information/Context

No response

CDK CLI Version

2.160.0 (build 7a8ae02)

Framework Version

No response

Node.js Version

v18.19.1

OS

Ubuntu 24.04.1 LTS

Language

.NET

Language Version

.Net 8.0.108

Other information

No response