When I use First Aid 1.10.1 for 1.17.1 together with the 1.17.1-Forge-37.1.0 , then nothing spawn (no items inside) in the minecarts with the chest inside (which are in mineshafts). The same problem is in ordinary chests in the igloo.
Mineshaft:


Igloo:

Should be fixed in 1.18.x and upwards, I semi-rewrote loot handling in 4719199

Thanks!