Subscription skips first transaction to an empty wallet

[niknaylos]

Im encountering the issue where first incoming usdt transaction on empty wallet is being skipped by SubscribeOnTransactions()

Use case: I generate unique subwallets for my customers and receive their payments in usdt there, to confirm deposits I want to subscribe on subwallet's transactions

However first transaction to a fresh subwallet is not being captured by SubscribeOnTransactions()
Is there a workaround for this scenario?

example transaction that wasnt captured:
https://tonviewer.com/EQCgsg5UnDSguVJlLAZHNRG4r5RVvQu-cupAuY5SfQOxdltC

I created sample issue repo that creates fresh subwallet and subscribes on its transactions just in case:

https://github.com/niknaylos/sample-issue

[niknaylos]

i assume the fix is this?
f80aa60#diff-5ece0e1a78dc287e4829da70af57acc46d3ea3cefb21cde6a5e2283ffb41d5b9

[xssnick]

I tried to run SubscribeOnTransactions with your example address EQCgsg5UnDSguVJlLAZHNRG4r5RVvQu-cupAuY5SfQOxdltC, and it returned this single tx, seems working for me. Or it happens only when address was not initialized before starting subscribe?

[niknaylos]

Ye, the issue happens if account is nonexist before first transaction arrives and has no lastTxLt

The commit I mentioned seems to be fixing the issue as long as account goes nonexist -> uninit after the first transaction (otherwise transaction wont be captured anyway)