lwsmiser

I am running Cura 4.11 beta for my Ender 5 printer with a 0.4 mm hardened steel nozzle with TH3D Studio firmware. I have been printing First Layer test prints with several other versions of Cura, 4.8, 4.9 and 4.10 without this problem. But with Cura 4.11 when I set the first layer thickness at 0.2 or 0.3 Cura 4.11 refuses to slice the model. If I change the thickness to 0.201 or 0.303 Cura 4.11 will slice them and print them correctly. Cura 4.11 insists on using a thickness of 0.198 mm but will not slice. Curiously when I scale the Z thickness it is referred to 0.198 to calculate the % scaling. I am not sure what is going on but the software seems to be ignoring the first layer thickness I set. What am I missing here?