If custom permissions are enabled for a field, then on submit of the field config edit form every user role is updated regardless of any changes to the permissions. This triggers events on the role config entity that should not occur.
Install field_permissions.
Edit a field, enable custom permissions, and save the field.
Edit the same field and save it without making any changes.
NOTE: In order to see the roles being updated use your preferred method to trace the running code, OR output messages to the page each time a role is updated.
Only save a role if permissions have changed.
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Needs review
2.0
Code
My bad, you are right. I had enabled update in composer.json for this patch. So it was downloaded automatically.