Teshar / Lurrus Interaction Bugged
With 2 Lurrus's in the graveyard, a Teshar on the battlefield, and 2 Mox Ambers in the graveyard, you should be able to establish a loop where you.
Play a historic spell reanimating Lurrus with Teshar's trigger
Cast Mox Amber with Lurrus, triggering Teshar and reanimating the second Lurrus, sacrificing the first one to the legend rule.
Cast the second Mox Amber using the 'fresh' ability of the new Lurrus that was just reanimated, triggering Teshar, getting back the first Lurrus, and sacrificing the second Lurrus and the second Mox Amber to the legend rule.
Instead, the game doesn't recognize that a 'new' Lurrus is on the battlefield no matter which Lurrus you choose to sacrifice when reanimating the second one with Teshar. When trying to create the loop, the game will only let you cast one card with Lurrus out of your graveyard for the entire turn, no matter which Lurrus you choose to keep for the legend rule.
Here is a video demonstration: https://www.youtube.com/watch?v=5bM3k2yKZ3Q
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Yeah, I granted one Lurrus haste with Kenrith and was able to progress through the combo. Unfortunately this meant far more clicks and ended roping. Teshar then triggered on my second main phase without me being able to choose, and then asked for a choice during the opponent's turn. These cards need some cleaning up.
One thing that makes this strange in particular is that other Legendary permanents that look identical (both summoning sick and untapped) do not "stack" like Lurrus does (ex. reanimating 2nd Emry with Kethis). It's almost as if the game treats it as non-Legendary except for the state-based sac.
Too further expand on this, I've only found the issue when you have two Lurrus with summoning sickness. If I start the turn with a Lurrus in play this doesn't appear to be an issue.. But if I put two Lurrus in plan on the same turn I'm no matter which Lurrus I choose due to legendary rule I'm unable to use the ability again.