[I] [6.0.0] Dashboard import broken [superset]

[via GitHub]

maxfrei750 opened a new issue, #35177:
URL: https://github.com/apache/superset/issues/35177

   ### Bug description
   
   ## Steps to reproduce
   - Uncertain if relevant: create a custom theme according to the [theming 
guide](https://superset.apache.org/docs/configuration/theming/).
   - Export a dashboard
   - Try to import it
   
   ## Additional information
   - Using docker: apache/superset:6.0.0rc1
   
   ## Thanks a lot for your awesome FOSS.
   
   ### Screenshots/recordings
   
   _No response_
   
   ### Superset version
   
   master / latest-dev
   
   ### Python version
   
   3.9
   
   ### Node version
   
   16
   
   ### Browser
   
   Firefox
   
   ### Additional context
   
   ## Error stack
   
   ```
   2025-09-17 15:51:20,455:WARNING:superset.commands.importers.v1:Import Error: 
{'theme_id': ['Unknown field.']}
   2025-09-17 
15:51:20,456:INFO:superset.commands.dashboard.importers.dispatcher:Command 
failed validation
   2025-09-17 
15:51:20,456:WARNING:superset.views.error_handling:CommandException
   Traceback (most recent call last):
     File "/app/.venv/lib/python3.10/site-packages/flask/app.py", line 1484, in 
full_dispatch_request
       rv = self.dispatch_request()
     File "/app/.venv/lib/python3.10/site-packages/flask/app.py", line 1469, in 
dispatch_request
       return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
     File 
"/app/.venv/lib/python3.10/site-packages/flask_appbuilder/security/decorators.py",
 line 109, in wraps
       return f(self, *args, **kwargs)
     File "/app/superset/views/base_api.py", line 120, in wraps
       duration, response = time_function(f, self, *args, **kwargs)
     File "/app/superset/utils/core.py", line 1409, in time_function
       response = func(*args, **kwargs)
     File "/app/superset/utils/log.py", line 304, in wrapper
       value = f(*args, **kwargs)
     File "/app/superset/views/base_api.py", line 107, in wraps
       return f(self, *args, **kwargs)
     File "/app/superset/dashboards/api.py", line 1595, in import_
       command.run()
     File "/app/superset/commands/dashboard/importers/dispatcher.py", line 57, 
in run
       command.run()
     File "/app/superset/utils/decorators.py", line 267, in wrapped
       return on_error(ex)
     File "/app/superset/utils/decorators.py", line 232, in on_error
       raise ex
     File "/app/superset/utils/decorators.py", line 260, in wrapped
       result = func(*args, **kwargs)
     File "/app/superset/commands/importers/v1/__init__.py", line 84, in run
       self.validate()
     File "/app/superset/commands/importers/v1/__init__.py", line 120, in 
validate
       raise CommandInvalidError(
   superset.commands.exceptions.CommandInvalidError: Error importing dashboard
   ```
   
   ## superset_config.py
   
   ```
   """Superset configuration."""
   
   import os
   
   
   SUPERSET_DB_USER = os.getenv('SUPERSET_DB_USER', 'superset')
   SUPERSET_DB_PASSWORD = os.getenv('SUPERSET_DB_PASSWORD', 'superset')
   SUPERSET_DB_NAME = os.getenv('SUPERSET_DB_NAME', 'superset')
   
   SQLALCHEMY_DATABASE_URI = (
       
f'postgresql+psycopg2://{SUPERSET_DB_USER}:{SUPERSET_DB_PASSWORD}@superset-db:5432/{SUPERSET_DB_NAME}'
   )
   
   FEATURE_FLAGS = {
       'ENABLE_TEMPLATE_PROCESSING': True,
       'EXTRA_CATEGORICAL_COLOR_SCHEMES': True,
   }
   
   
   ENABLE_PROXY_FIX = True
   
   
   # Theme configuration
   FAVICONS = [{'href': '/static/assets/images/favicon.ico', 'type': 
'image/x-icon'}]
   APP_NAME = 'Dashboard'
   LOGO_TARGET_PATH = '/'
   LOGO_TOOLTIP = APP_NAME
   
   EXTRA_CATEGORICAL_COLOR_SCHEMES = [
       {
   ...
       },
       {
   ...
       },
   ]
   
   THEME_DEFAULT = {
       'token': {
   ...
       }
   }
   
   THEME_DARK = {
       'token': {
   ...
       },
       'algorithm': 'dark',
   }
   
   ```
   
   ### Checklist
   
   - [x] I have searched Superset docs and Slack and didn't find a solution to 
my problem.
   - [x] I have searched the GitHub issue tracker and didn't find a similar bug 
report.
   - [x] I have checked Superset's logs for errors and if I found a relevant 
Python stacktrace, I included it here as text in the "additional context" 
section.


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