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.