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So I don't see that but switching the displacement type it doesn't subdivide actually at all after switching for me.
And they are linked btw
Finally tested the file. Can not get it to crash on my system this session.
One thing I find odd is that subdivision seems coupled to the object and NOT the material. If I make a new object and apply the same material, all subdivision setting for the material has been changed to defaults. It is almost as if the object settings are exposed in the shader and has no coupling to the material and just is there for convenience. I find it confusing.
Also. If I make a linked copy (alt-d) of a cube in the scene the renderer will die with "ERROR" (but I have reported that separately if I remember correctly)