Corvettes - When (patch notes?) did they gain a PropMod and (separately) lose the Trit?

In 2017 it was already called Corvette and got one Trit in Cargo. Not sure, I think the Trit was still in there 2020.
At least in 2021 they didn’t any more: Suggested Idea: Docking fees - #12 by Astelon_Bheskagor
That’s the first mention of the button in the station (May 2019): https://www.eveonline.com/news/view/patch-notes-for-eve-online-invasion

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