Possible mistakes in force nft upgrade function

[mnill]

Looks like this line was for testing purpose and leaked in production code

tip4/contracts/abstract/CollectionUpgradableBase.tsol

Line 284 in 064788b

offset = 0;

And flag 64 must be used only in case this is only single outcoming message in the transaction.

tip4/contracts/abstract/CollectionUpgradableBase.tsol

Line 303 in 064788b

flag: 64,