TYPO3 Core

The routes are not really correct in the example extension
site configuration. Therefore, I advise you to read the
documentation regarding the routing and the extbase route
type and the required options [1].

All of the routes are missing a aspect mapping for the
argument `model` to a extbase table and slug field. Without
it it won't work. On top of that, your model is missing a
slug field. So you should add that first in the `ext_tables.sql`
and as a `tca field` - for example a `path_segment` field [2].

Than, your site configuration routing should be look like
following:

routeEnhancers:
  testbug:
    type: Extbase
    limitToPages:
      - 74
    extension: Bugtest
    plugin: routingtest
    routes:
      -
        routePath: '/list/'
        _controller: 'Testmodel::list'
      -
        routePath: '/bugedit/{model}'
        _controller: 'Testmodel::edit'
        _arguments:
          model: testmodel
      -
        routePath: '/bugedittwo/{model}'
        _controller: 'Testmodel::editTwo'
        _arguments:
          model: testmodel
      -
        routePath: '/bugupdate/{model}'
        _controller: 'Testmodel::update'
        _arguments:
          model: testmodel
      -
        routePath: '/bugupdate/{model}'
        _controller: 'Testmodel::show'
        _arguments:
          model: testmodel
      -
        routePath: '/bugdelete/{model}'
        _controller: 'Testmodel::show'
        _arguments:
          model: testmodel
      -
        routePath: '/bugcreate/'
        _controller: 'Testmodel::create'
      -
        routePath: '/bugnew/'
        _controller: 'Testmodel::new'
    defaultController: 'Testmodel::list'
    aspects:
      model:
        type: PersistedAliasMapper
        tableName: tx_bugtest_domain_model_testmodel
        routeFieldName: path_segment 

As a general hint, ensure not to use the
`features.skipDefaultArguments` setting for
your plugin.

# extension ext_tables.sql 
CREATE TABLE tx_bugtest_domain_model_testmodel(
  path_segment varchar(2048),
  KEY path_segment (path_segment(127))
);

and the TCA example for that field and your table (partly)

[
    'columns' => [
        'path_segment' => [
            'exclude' => 1,
            'label' => 'slug_1',
            'description' => 'field description',
            'config' => [
                'type' => 'slug',
                'generatorOptions' => [
                    'fields' => [
                        'input_1',
                        'input_2',
                    ],
                    'fieldSeparator' => '/',
                    'prefixParentPageSlug' => true,
                    'replacements' => [
                        '/' => '',
                    ],
                ],
                'fallbackCharacter' => '-',
                'eval' => 'uniqueInSite',
                'default' => '',
            ],
        ],
    ],
]

[1] https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Routing/AdvancedRoutingConfiguration.html#extbase-plugin-enhancer
[2] https://docs.typo3.org/m/typo3/reference-tca/11.5/en-us/ColumnsConfig/Type/Slug/Index.html