second wallet disapear

[ka2er]

Hi, I had setup my nano S ledger with the 24 words.
I send BTC to the main account segwit (4 times) and decided to create a second one account.
I send funds to the second one : https://blockchain.info/address/34X15ArQpQz2MGXrS8b2V4fJVhko4aSgGn.

Don't know what exactly happen, but I had hided the second account.
few weeks later upgraded bitcoin app on the key.
few weeks later when I opened the BTC app again I'm unable to get back the second account.

I tried to re-create a second account, it appears but it's empty
I noticed when I delete the newly created second account that the root bip44 path is 49'/0'/2'.

I was believing index were 0 based and first address of first account must be 49'/0'/0'/0'
and first address of second account must be 49'/0'/1'/0' vs 49'/0'/2'/0'

Do I miss something, and do you have a working fix to get back access to funds of my second account ?

thanks.

EDIT

furthermore if I check device logs I saw HTTP GET Requests to

Mon, 29 Jan 2018 05:12:38 GMT,INFO,WalletLayoutRecoveryTask,Recover batch 0 for account 1
https://api.ledgerwallet.com/blockchain/v2/btc/addresses/34X15ArQpQz2MGXrS8b2V4fJVhko4aSgGn[...truncated...]

which tends to prove that it's my generated public address for second account, and you could check your servers logs you will see a hit

[ka2er]

fixed by myself : settings > tools > other : reset application data

don't understand what has caused the trouble ? any ideas ? upgrade or server error ?