Secondary drive mounted prevents booting to gaming mode

I tried searching and haven't seen anything else mentioning this. I can format, mount and add a secondary drive in desktop mode, but after doing so I can no longer switch into gaming mode it crashes back to desktop mode.

I can see Process 38012 (steamwebhelper) of user 1000 dumped core. in the logs around the time it's happening. Has anyone seen this before?
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