ZBrushCentral

Strange Autosave behavior on crash

I was editing an object using the ZModeler tool (specifically, I was spinning an edge) when ZBrush crashed! I saw that it said “file saved successfully” in the corner, and was relieved. However, and this is strange, it didn’t save the ZTool (like it usually would) and instead saved a DOCUMENT? So, I opened the recovered document, and sure enough, the last sight I saw before the crash was there, but it’s a DOCUMENT. I can’t seem to edit it. Strangely enough, the depth data seems to be there (as drawing a tool on the canvas interacted with it).

Is there some reason for this behavior? Also, is there a way to turn it back into a ztool?

EDIT: I managed to replicate the problem. Again, I used the spin function of the ZModeler brush and the ZBrush crashed. Instead of saving the tool out, it saved the document. Thankfully, this time I managed to save the tool before using the spin function…