This is technically inconsistent with arrows, another piercing projectile, which do in fact do this.

I remembered this being the case in 1.7.10 and decided to test it just to be sure. It technically worked back then, but in a buggy way: they appeared as arrows when stuck in the player, rather than javelins.

This is technically consistent with tridents, another piercing projectile, which don't in fact do this.

I'd also say this falls under the general purview of suggestion/enhancement and thus should be put in our discord's #suggestions channel, not our issue tracker.