define allowed_values_function in your fieldstorage ex. field.storage.node.field_testselect.yml. and import configuration.
define the function mentioned here to any module file with proper naming. this function can return dynamic options to your select field.
this method is not working as expected because in ui_patterns_settings.module file line-111 for 8.x-2.0-beta13 it is overriding the allowed_values_function setting to null value.
i am not sure but this seems to be happening for all select fields.
any ideas for alternate solution for allowed_values_functions to work?.
put some conditions to not to override this settings for all fields.
Fixed
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