Spin-off from #1499596-96: Introduce a basic entity form controller → :
I noticed that due to $controller->form_state the form state gets serialized *into itself* when it is cached. I've discussed that with plach and we agreed to remove $controller->form_state for now and just pass it on to respective methods always. We may want to simplify the getEntity() calls to do not require the passed on form-state again in the follow-up where we fix the controller being still duplicated to $form and $form_state.
To be completed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Wonder if this is still an issue or a way to verify?
There has been no work on this task for 13 years. It is likely that it is no longer needed or has been implemented. Therefor, closing.
If there is work to do here, then either re-open the issue and add a comment or open a new issue and reference this one.