Partner and I were doing Railjack defense for Ash components. The first time, we got the message, it was after we completed two sets of enemy waves, but the "Not eligible due to inactivity" message was in the second reward space, and our second reward was in the third space. The second time we ran the same defense, we went for three sets of waves. We then got the message after each set, so it looked like we played one rotation, skipped one, played one, skipped one, etc. We didn't think to screenshot the error - we were totally surprised by it, but if you look at the interception bug with the same title (from April/May this year), there is a picture of what our messages looked like. We did not lose any items, the "Not eligible due to inactivity" message was inserted between the wave sets we completed.