Can't Use New Custom Image In Existing Space

### Product Version

- [ ] Amazon SageMaker Studio Classic
- [X] Amazon SageMaker Studio
- [ ] Issue is not related to SageMaker Studio

### Issue Description

I created a new image and attached it to my domain. The image shows as being attached to the domain and I can create a new JupyterLab space and use the image to start and execute commands in a JupyterLab. When I try to use the image in a space created prior to attaching the new image I get an error saying the image is not present in the list of custom images (even though it is).

### Expected Behavior

User should be able to use custom image in existing space

### Observed Behavior

ResourceNotFoundError: Unable to launch App [arn:aws:sagemaker:us-west-2:....] with Image [geospatial] because it is not present in list of custom images in AppSettings. Please update AppSettings to add Image [geospatial] in list of custom images.

### Product Category

JupyterLab

### Feedback Category

_No response_

### Other Details

_No response_

No repository files or tests are identified. Start by reproducing the flow with a custom image attached to the domain, comparing a newly created JupyterLab space with an existing space; done means the existing space can launch with that image without the AppSettings error.

Written by the indexing model from the issue text.