Xanathar’s Guide to Everything introduces racial feats (ex: Bountiful Luck for halflings).
My understanding of the Reincarnate spell is that if you were a variant human and become something else, you lose the variant human’s starting feat. This seems to be supported by Sage Advice : https://www.sageadvice.eu/2016/06/18/if-my-pc-is-reincarnated-do-they-lose-their-bonus-feat-and-skills/
Is the same true for racial feats (ex: level 4 halfling with bountiful luck reincarnated into dwarf, loses racial feat?).