This happened to me way back when...told this story before, too.
After the session (cough-cough), I was given a cassette (tells you how long ago this was)...sounded pretty good (bass sounded very good & upfront).
Couple weeks, I hear the "mastered" version: Bass now sounds like I am hitting a pillow.
I asked the songwriter "What happened?!?! What is
that"?
He said, "Compression".
Any energy/dynamics was sucked out...haven't been a fan of compression since.
Later, it all made sense: The engineer had no clue with the bass, especially those that did not wield a pick. Come to think of it, he asked that I use a pick...& I thought about walking. The songwriter struck a deal...we would try fingers 1st & if it wasn't good I would use a pick (actually, I woulda walked).

Anyway, I heard LPs that came out of that studio (with some great local bassists)...same deal. Bass was a 2nd Class citzen. Guitars & vocals were wonderful, FWIW.