Yep, I did, that was standard procedure for me - especially once I saw how the merit gain messages are, and aren't, displayed. It's also how I noticed that for UC sales, the game sometimes either doesn't display merits gained, or displays the same merit gain twice.Pardon for asking, but when you checked exobiology for ALD did you note your merits before and after the hand-in, from the Powerplay UI (I mean the UI that appears on the right hand panel when in the ship, though you can also access it via the on-foot menu wheel thing).
Also, I made sure that I'd collect and sell samples after the earlier cut-off date. No dice. Despite selling billions in credits, and making sure that I'd get high-paying stuff too (like TWAs), so far, zero merits from exobio... for me. Searching the ALD Discord again turned up two examples where three players mentioned they sold exobio and got no merits. They wrote these after the infamous date, but I don't know when they collected the samples. So, it's not much evidence, but it does back up my personal experience.
I wouldn't be surprised if this were either a bug or by (faulty) design. After all, Frontier doesn't seem to have considered much about exploration and exobiology in PP 2.0, other than "oh we should throw that in too I guess".