Image slot labels are not loaded from json

[karl-von-knecht]

Expected Behavior

When I do the following:

1. Create new workflow
2. Add a node "Upscale image"
3. rename the input slot "image" to "test"
4. Save Workflow
5. Close Workflow
6. Load Workflow

then I should see:
an "Upscale Image" node with an input slot labeled "test"

Actual Behavior

Actual behaviour:
I see an "Upscale Image" node with an input slot labeled "image"

Steps to Reproduce

1. Create new workflow
2. Add a node "Upscale image"
3. rename the input slot "image" to "test"
4. Save Workflow
5. Close Workflow
6. Load Workflow

Debug Logs

Additional notes: 
- this bug breaks workflows that use "Anything Everywhere" nodes because these rely on correct labeling
- the bug seems to affect only slots of type image. Slot labels of other types are preserved as expected.

Other

No response

[LukeG89]

There was an issue about that in the frontend repo:

• [Bug]: Renamed input/output slots are reset on refresh Comfy-Org/ComfyUI_frontend#1899

The problem should be solved in the next release (when this PR will be merged):

• Update web content to release v1.5.17 #6048