Can't open draft email for editing

Can't open draft email for editing

Last night I started composing an email and I let it save in drafts.
This morning I want to continue working on the email. It is in my Drafts folder but it will not open. The only option there is to delete it.
This is not the first time it has happened. On previous occasions I have just deleted the draft and started afresh, but I really want this one back.

Windows 10 with Pale Moon 28.10.0 browser.

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