Hi Hans, It seems that there is a bug in the handling of Blackboard Bold, in the latest lmtx (version 2019.08.02 19:40). The following gives the attached PDF file. However the same file typesets correctly in the latest mkiv beta.
Thanks for your attention: OK \starttext The set of integers is denoted ${\Bbb N}$. \stoptext
bug-lmtx.pdf
Description: Adobe PDF document
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