I was updating the contrib modules in my project and Action module was installed. After updating the modules, I tested my migrations and received an error "The "" plugin does not exist. Valid plugin IDs for Drupal\migrate\Plugin\MigrateSourcePluginManager are: embedded_data, empty, url, table, csv".
Uninstalling the Action module fixes the migrations and after digging the code a bit, the issue seems to be in the "action_migration_plugins_alter" function in the action.module file. Removing the function fixes the migrations and allows the Action module to be enabled. Unfortunately I couldn't understand the issue with the function to properly fix it so I just removed it with a custom patch since we do not need the Action plugins in our migrations.
Have some migrations and Action module installed. Try running migration and see if the error comes up.
I assume the function "action_migration_plugins_alter" is trying to map the use of Action plugins in migration to correct plugins in the code. This probably needs refactoring.
Postponed: needs info
1.0
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