Mail Rules disappeared after upgrade to Sequoia 15.0.1
I upgraded from Sonoma 14.7 to Sequoia 15.0.1, and most of my Apple Mail rules (all except 4 which were really old) have disappeared.
I restarted in Safe Mode, rules still gone, restarted again normally, rules still gone.
3.3 GHz 6-Core Intel Core i5
8 GB 2667 MHz DDR4
Sequoia 15.0.1
Apple Mail Version 16.0 (3818.100.11.1.3)
iMac 27″, macOS 15.0