julia> 0x1p3.2
1.6

julia> @code_typed(0x1p3.2)
CodeInfo(
1 ─ %1 = Base.mul_float(x, y)::Float64
└──      return %1
) => Float64

julia> 0x1p3 * 0.2
1.6

If I understand the manual correctly then this is unintentional and a bug. At the very least it's very confusing to me. Relates to #16356, where juxtaposing integer hex literals was banned.