I am running into this issue as well, but it is occurring on custom scripts that I've written. These scripts have worked for years without issue and have started failing with this error in the last couple of months. At first I thought it was because they had some legacy ArcPy code in there that was no longer playing nicely with Pro, but after re-writing several of them using the latest API, I'm still running into the issue. For me, the common denominator seems to be Spatial Analyst tools. I have confirmed that the error does not occur consistently. I'll think that I've fixed it because the script will run successfully, only for the issue to crop up again on a subsequent run. I can also confirm that the input paths used NEVER contain any spaces. (such an antiquated requirement anyway). I'll let you know if I'm able to sleuth out a solution.