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Apparently it is impossible to edit a question that has a pending suggested edit. I have reached the limit on how many suggested edits I can review today, so I suddenly cannot edit the question. This is really stupid.
Normally I can edit a question in the most extreme situations: when another editor has finished just before I did, or when there is a suggested edit made after I opened the edit form. However, when I have to (re)open the edit form and there is a pending suggested edit and I have reached my edit review limit, then I am suddenly not allowed to edit.
This looks like an unintended side-effect of the daily suggested-edit review limit. Of course I understand that the suggested edit should be reviewed before I continue with my edit; therefore I suggest that the edit review limit is not applied when the question is viewed directly (instead of via the review queues).
Or maybe even better, as Back in a flash suggests, to allow the suggested edit to be improved even when the edit review limit has been reached. That way one can combine my intended edit with the suggested edit.