ErrorWidget only working once

Thanks for the great package first of all.

When starting the app and coming across a broken url, the errorWidget is shown after a short loading phase (during which the placeholder is shown). That's working as expected. But once I encounter an image with the same url (e.g. pushing a detail page), the placeholder is shown forever, instead of switching to the errorWidget. No matter whether state is disposed, the errorWidget will never be shown again until a Hot Restart is being performed.

Since my placeholder widget (a shimmer loading animation), differs from the errorWidget, this creates the impression of a broken connection, which might confuse some users.

It think it's quite a big issue (at least for me), so I would appreciate any solution proposals.