First of all, the "lantern"beads shown are not "millefiori." They are pseudo-millefiori at best, but are equally "confetti" beads. The units of decoration are pieces of tiny striped canes, that have apparently been hot-tumbled to become spheroidal elements. These are then randomly dispersed onto the molten bead base, and are fused in. Millefiori work is much more precise than this style, that is almost unique to Japan.

Nevertheless I have seen a similar bead that I suspect might be an Indian copy of a Japanese "beach-ball" bead. (My name for the Japanese pseudo-millefiori beads, that I devised thirty+ years ago, when I worked out how they were made.)

I have also discussed multiple times that post-WWII (the 1940s to 1950s), Czech practitioners trained beadmakers in India and Japan to perform lampwork--thus causing similar beads to be made in those places. Abundantly in Japan. So, naturally, a ceramic bead release would have been used.

I thought this was a question as to whether bead release in beads were present or absent (!). Clearly, for Most lampworked beads it would have been used. However, that doesn't mean it would necessarily still be present.