Summary:
Relates to MC-136208, which was surprisingly fixed. Armadillos continue to drop scutes even when the gamerule doMobLoot is disabled, a behavior inconsistent with turtles due to the fix. This inconsistency might be intentional.

Steps to reproduce:

1. /gamerule doMobLoot false

2. /summon minecraft:armadillo ~ ~ ~ {scute_time:0}

Observed result:
The armadillo dropped an armadillo scute.

Expected result:
The armadillo should not drop an armadillo scute.

Note:
This gamerule likely shouldn't influence scute drops when using a brush on the armadillo.

Video:
armadillo doMobLoot false.mp4