I was trying to emulate a menu of sorts in my adventure map using named armor stands as placeholders for players, and long story short eventually found that using the @e selector or anything derived from it as the <destination player> argument for /tp produced an error stating "The entity UUID provided is in an invalid format" after working a few times, unless the [target player] argument was omitted, in which case it worked perfectly well. This was with some light modding (Optifine, Schematica, some HUD mods), so I re-tried in vanilla MC and the same thing happened in a different world. Quitting and rejoining either world did not fix it, nor did restarting the launcher.
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Using just /tp @e works perfectly fine, actually, it teleports me to every single entity in the world in some unknown order instantaneously; but that doesn't really help anything 😛
And yeah, it isn't the vanilla launcher, but it doesn't have any effect on vanilla MC, and the only effect it has on modded MC is modding it.
Unfortunately, the bug tracker does not support modded versions; however you can try the Modified Client Support section of the Minecraft Forums. You can also update this ticket if you are able to reproduce the issue with the official launcher.
EDIT: Does MC-48656 seem related to your issue? It's much less descriptive however
if it finds more then 1 entity, it does that, you cannot teleport to 2 diffrent locations at once
also
this does not sound the official launcher to me