example user clicks in google search which is broken or move -> https://classifieds.demoflynax.com/motors/fsgfasfgasd/

step 1: user get 404 error <- OK
step 2: if user tries to navigate other category CARS in menu user get -> /404/ in url -> https://classifieds.demoflynax.com/404/cars.html

How to fix please