The noun (and verb) rollback on Stack Exchange means to undo or reverse an edit. I'm not sure if there is a difference between the two, but that's how I understand it.
Recently, I posted the past participle rollbacked, in a comment, and after a bit I looked at it and realised I should have written rolled back.
The problem is that rollback is spelt as one word, so adding the suffix -ed was an automatic gesture. And if I think about it, backed is an adjective, and back is also a verb. Here's another example, double-click, is the past tense doubled-click or double-clicked?
Was I so wrong to write rollbacked?
Why should it have been rolled back (two words)?
Are there cases of compound nouns (and verbs) where either the first noun/verb or the second can be placed in the simple past tense with no changing in meaning? I can't think of any on the top of my head.