ReshardingTest#_checkDonorPostState() asserts that the donor shard has dropped the collection which was resharded by the time the reshardCollection command returns. However, as reported in SERVER-55781, index builds do not properly check the shard version and can lead to a collection with the same name being implicitly created on the donor shard with a different UUID.

The following assertion should be relaxed to say either (a) the collection doesn't exist (collInfo === null) or (b) the collection does exist but has a different UUID than before the resharding operation started (!bsonBinaryEqual(this._sourceCollectionUUID, collInfo.info.uuid)).

_checkDonorPostState(donor, expectedErrorCode) {
    const collInfo = donor.getCollection(this._ns).exists();
    const isAlsoRecipient =
        this._recipientShards().includes(donor) || donor.shardName === this._primaryShardName;
    if (expectedErrorCode === ErrorCodes.OK && !isAlsoRecipient) {
        assert.eq(
            null,
            collInfo,
            `collection exists on ${donor.shardName} despite resharding having succeeded`);