An investigation by ProPublica, The Texas Tribune and Votebeat found that U.S. citizens were incorrectly labeled as noncitizens or removed from the rolls because they did not respond to letters about their citizenship.
Texas Gov. Greg Abbott announced on Monday that the state has removed roughly a million people from its voter rolls since he signed a legislative overhaul of election laws in 2021.
Probably much more than that:
Source: https://www.texastribune.org/2024/08/27/greg-abbott-voter-rolls-texas/