So, WotC... gonna refund us for these jump-ins?

Roku/powerful

Same is happening to me.

I looks like Rebelling and Powerful packs are both having this issue

27 lands?

Same for me. Got this deck: 5 creatures, 27 lands. The "rebelling" option flooded me with plains, swamps, mountains and a defeat streak.

Deck
1 Cunning Maneuver (TLA) 130
1 Yuyan Archers (TLA) 161
1 Zuko, Firebending Master (TLE) 127
1 Mai, Jaded Edge (TLA) 147
1 War Balloon (TLA) 159
1 Dragon Moose (TLE) 235
1 Fire Nation Attacks (TLA) 133
1 Mongoose Lizard (TLA) 148
1 Frantic Confrontation (TLE) 117
1 Firebending Lesson (TLA) 138
1 Fists of Flame (TLE) 166
1 Lightning Strike (TLA) 146
1 Lost in Memories (TLE) 121
1 Thriving Bluff (TLE) 260
1 Sun-Blessed Peak (TLA) 280
1 Boiling Rock Prison (TLA) 267
1 Mountain (TLA) 285
1 Mountain (TLA) 285
1 Mountain (TLA) 285
1 Plains (TLA) 282
1 Swamp (TLA) 284
1 Mountain (TLA) 285
1 Plains (TLA) 282
1 Swamp (TLA) 284
1 Mountain (TLA) 285
1 Plains (TLA) 282
1 Swamp (TLA) 284
1 Mountain (TLA) 285
1 Plains (TLA) 282
1 Swamp (TLA) 284
1 Mountain (TLA) 285
1 Plains (TLA) 282
1 Swamp (TLA) 284
1 Mountain (TLA) 285
1 Plains (TLA) 282
1 Swamp (TLA) 284
1 Mountain (TLA) 285
1 Plains (TLA) 282
1 Swamp (TLA) 284
1 Mountain (TLA) 285

Same, in case it matters, I selected Rebelling and Firebending. Ended up with a 27 land deck. It looks like only the Firebending non-land cards were added

Same here. 28 lands, 12 cards, it's completely unplayable

Edit: Every single game I'm stuck with a hand like this (see image). This bug has cost me 2 jump-in tokens for 2 genuinely unplayable decks. It literally didn't copy over any white card from my second pack into my deck. It needs to be fixed immediately and those affected need to be refunded their tokens.