I noticed that last week I had 4 incubation chambers in the Creation Lab and that they were priced at 10, 25 and 100, or something like that, definitely cheaper than the direct jump to 100. I had originally naively thought that it was perhaps part of reaching level 65 or something like that but now they disappeared. I didn’t see anyone post about having 4 incubation chambers and doing a search I can only find some posts indicating that a 3 chamber had appeared and eventually disappeared at some point.
Does this happen occasionally? Is there a pattern?