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I've personally never used the "b" without an attribute but based on documentation it should work without one. Also, I tested it in a filter and it appears to work fine there with just a b and no attribute. Might be a bug support can look into?
I'm seeing this as well in the form builder, but it continues to work in my calculations I believe. I've been seeing more and more calculation errors in the form builder that were not giving me any errors up until recently. This is frustrating - since there will come a time soon where I do need to make changes to a form and I won't be able to save if the issues continue.