The part of the code that is commented with:
```
/* gst_validate_action_set_done() does not finish the action
* immediately. Instead, it posts a task to the main thread to do most
* of the work in _action_set_done().
*
* While the EOS handling lock guarantees that if an action had to call
* gst_validate_action_set_done() it has done so, it does not guarantee
* that _action_set_done() has been called.
*
* Is it possible that this handler is run before _action_set_done(), so
* we check at this point for actions that have a pending_set_done and
* call it before continuing. */
```
was not being executed in the case where the scenario was 'ignoring EOS'
while it was also required.
Also fix potential use after free in that specific code path.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9014>
d0b2e6cb68