>>6319886The official TIES (at least the two newest ones) use part 87609, "Plate 2 x 6 x 2/3 with 4 Studs on Side", instead of the 99780, "Angular Plate 1.5 Bot. 1X2 1/2". I'd be willing to bet One (1) Internet that that's where the stress is coming from.
Picture related.