I read a user’s help request in an online forum that was interesting because it illustrates what can happen from time to time. The symptom that the user was experiencing was that there was way too much squish in their first layer of printing. It was almost non-existant.

They were stumped for a while as to what the cause was. In reading through their comments and the things that they tried, it turned out that they had a BLTouch. Basically, what had happened was that they had set up a mesh bed level manually, and then they allowed the BLTouch to override that stored level. A misconfigured BLTouch was the culprit, in this case. It was going through the motions, but it was storing an inadequate bed level, which was overriding the valid mesh bed level that they had stored previously.