PRD: Sending import queue PRD (block 10 from 12) - STMS

Hello.

For some time now when I refresh the Import queue (STMS) from a productive system this notification occurs: "PRD: Sending import queue PRD (block 10 from 12)" as it cycles through "block 1 to block 12", as if it were trying to read something. This doesn't occur in DEV nor QAS when transporting...

I've seen this prd-sending-import-queue-prd-block-7-from-8[topic|prd-sending-import-queue-prd-block-7-from-8] here with similar issue, however I'm not able to understand the "answer" provided.

If anyone could give a little bit of insight about this I would appreciate. Thanks.