(deploy): Can't deploy stack with cross region reference with --exclusively flag

### Describe the bug

I have a cross region project (using crossRegionReferences) with 3 stacks. Two are deployed in eu-central-1 and the other (cloudfront distribution) is on us-east-1.

If I run `cdk deploy -e stack-common` it works perfectly. However if I run the `cdk deploy -e stack-cloudfront` it fails with:

```❌ stack-common failed: ToolkitError: Failed to create ChangeSet cdk-deploy-change-set on stack-common: FAILED, Parameters: [ssm:/cdk/exports/stack-common/] cannot be found. ```

I know the distribution exists in us-east-1 and I can see the parameter exists. This problem is resolved if I run without the flag --exclusively.

### Regression Issue

- [ ] Select this option if this issue appears to be a regression.

### Last Known Working CDK Library Version

_No response_

### Expected Behavior

Running cdk deploy --exclusively shouldn't report that resource cannot be found

### Current Behavior

❌ stack-common failed: ToolkitError: Failed to create ChangeSet cdk-deploy-change-set on stack-common: FAILED, Parameters: [ssm:/cdk/exports/stack-common/] cannot be found. `

### Reproduction Steps

cdk deploy -e stack-us-east-1
cdk deploy -e stack-outside us-east-1

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### AWS CDK Library version (aws-cdk-lib)

2.221.1

### AWS CDK CLI version

2.1029.2

### Node.js Version

22.22.1

### OS

macos 26.1

### Language

Python

### Language Version

python 3.12.10

### Other information

_No response_