The issue that opening a minecart with hopper provoked piglins ([MC-198874]) was fixed in 1.19.4, but breaking it still provokes them, while breaking a hopper doesn't.
MC-261374
Breaking a minecart with hopper provokes piglins unlike breaking a hopper
Open
5
(Unassigned)
Confirmed
Gameplay
Normal
Mob behaviour
1.19.4, 23w12a, 23w13a, 23w14a, 23w16a, , 23w31a, 1.20.2, 1.20.4, 1.21.1, 24w38a
Retrieved
No, breaking VS opening, also that was already resolved for 1.19.4 development versions, this affects 1.19.4 and 1.20 development.