I ran into the same bug. As a workaround, I changed the Asset Type to "O-Other" and then manually entered the Business Use % calculated earlier in the wizard. That fixed the depreciation back to the correct amount. I have sent TurboTax support a message to see if they will be restoring the "M-Home Office" asset type before tomorrow. If not, I will have to submit with "O-Other" instead.
Hope this helps you out.
