Date/DateTime property comparison in Where step

[yongkansage]

It seems the comparison operation is not supported? Tried the following,
g.V().Or(
__ => __.Where(a => a.ModifiedDateTime == null),
__ => __.Where(a => a.ModifiedDateTime < DateTime.UtcNow))

g.V().Or(
__ => __.Where(a => a.ModifiedDateTime == null),
__ => __.Values(a => a.ModifiedDateTime)
.Where(modifiedDateTime => modifiedDateTime < DateTime.UtcNow))

g.V().Or(
__ => ___.Values(a => a.ModifiedDateTime)
.Where(modifiedDateTime == null),
__ => __.Values(a => a.ModifiedDateTime)
.Where(modifiedDateTime => modifiedDateTime < DateTime.UtcNow))

The query similar to the following was expected:
g.V().or(.hasNot('modifiedDateTime'),.has('modifiedDateTime',lt(datetime('2021-10-07T00:33:44.536Z'))))

instead, all yielded the following:
g.V().or(.hasNot('modifiedDateTime'),.has('modifiedDateTime'))

The similar comparisons are translated properly in Choose step, but Choose step can only be used with Property step.