Query based on eq() stopped working for one predicate

We are running a Dgraph cluster using k8s on AWS - it’s version 1.2 of Dgraph, there are 3 Zeros and 3 Alphas with such resources:

dgraph:
  alpha:
    resources:
      requests:
        cpu: 1
        memory: 1Gi
  fullnameOverride: intouch-graph-engine
  zero:
    resources:
      requests:
        cpu: 100m
        memory: 200Mi

I have increased resources for Alphas to address some performance issues we had with our queueries (but this wasn’t related to this issue) as compared to the initial report