It's very rare for incumbent Democrats to lose congressional primaries based on ideology, absent redistricting. In the past 5 House elections (2016-2024), it happened 8 times total. This year it's happened 4 times so far and a bunch of states have yet to hold primaries.
final update out of Wayne County seals it: Donavan McKinney unseats Shri Thanedar. fourth incumbent House Democrat to get primaried out (excluding redistricting cases), fifth new democratic socialist in Congress (deleted and reposted to correct an error)