[NTG-context] Invisible floor and ceil math delimiters

[Maggyero]

Dear members,

Why the floor and ceil math delimiters don't display?

Code:

\starttext
\startformula
    \Bigl\lfloor \frac{x}{y}\Bigr\rfloor
\stopformula
\startformula
    \Bigl\lceil \frac{x}{y}\Bigr\rceil
\stopformula
\stoptext

Thank you in advance.


Maggyero
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