NotFoundException thrown though item exist in gw2sharp cache

[Taschenbuch]

usually, when you call v2.items for multiple item IDs and the gw2 api only knows some ids, it will simply return infos about the known ids and ignore the unknown ids.
BUT, when you repeat the same call, gw2sharp will throw a not found exception as if all ids are unknown though that is not true.

var client = new Gw2Sharp.Gw2Client();
var items = await client.WebApi.V2.Items.ManyAsync(new[] { 78599, 70093 }); // lvl 80 boost (unknown to api), shiny bauble (known to api)
var items2 = await client.WebApi.V2.Items.ManyAsync(new[] { 78599, 70093 }); // this will throw notFoundException

example to reproduce (happens in blish too):
https://dotnetfiddle.net/ZmWyRD

blish hud discord thread about the bug:
https://discord.com/channels/531175899588984842/1246217871521218661