Image marker in redactor

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I have mentioned this issue once before but it's still happening and wondered if anyone has a fix for it.

Something has changed since version 5.7.5.1 in regards to images in redactor.

All images uploaded into a content block through Redactor are receiving the image ID of 'image-marker' and this is causing a 'Duplicate ID' error while trying to validate a site.

Prior versions are fine.

anete