[NTG-context] Tabulate \NN not working

For some reason, the use of \NN as in the first table below is not working. It works fine using math columns, though, as in the second table below. \setupbodyfont[xits,10pt] \starttabulate[|c|c|] \NN x \NN ¬x \NR \HL \NN 𝕗 \NN 𝕥 \NR \NC 𝕥 \NN 𝕗 \NR \stoptabulate \starttabulate[|mc|mc|] \NC x \NC ¬x \NR \HL \NC 𝕗 \NC 𝕥 \NR \NC 𝕥 \NC 𝕗 \NR \stoptabulate