Grants is missing as an option for a new profile field
As described here: https://civicrm.stackexchange.com/questions/42365/profile-with-civigrant-custom-field-not
Short version: grant fields (of any kind) are unavailable to select into a profile. Existing grant fields in profiles are unaffected and work.
I notice that a new install does not have this issue, but my existing one does (which was created a few versions ago and got upgraded).
I suspect if I was smarter I'd know where this configuration lives, but I don't. Any hints?