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The other key typeOfFirstFixedSurface is a Code Table key whose values come from the entries in the Code Table 4.5. That table happens to have an entry (last one) of 255 which indicates a missing level however there are some code tables which do not have such an entry. For example Code table 4.234 and Code table 4.236. One could argue that the WMO should always include a missing entry in all their code tables but this is not the case. Even if they change this policy, previous versions of the GRIB2 tables will not have those 'missing' entries.
So the correct command would beis:
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