bugfix: fix mutations data loading dispatching when defer is enabled #3994
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This is a port of the mutation data loading #3737 for the case when defer is enabled.
When defer is enabled and dataloading is used for mutations the execution will hang and the dataloader will not be dispatched. Important that defer only needs to be enabled, even when there is no defer used, this bug occurs.
This is a special fix for 24: On master (next release of GJ) we will not have any separate dispatching strategy anymore for defer and this bug doesn't exist.