I've been submitting test transactions to the testnet via stellar labs, ie. using Horizon.
But as of this morning (NZ time), the transactions have not been appearing. It looks like the transactions go through, ie. I get a confirmation from Horizon, but the ledger sequence number is ahead of the live ledger by several hundred values.
Here's an example of a response I received from Horizon for ledger 7644807.
{
"_links": {
"transaction": {
"href": "https://horizon-testnet.stellar.org/transactions/88b8119f95dfd1918c706360fbfb77e30189711627568009b56be8c116031aea"
}
},
"hash": "88b8119f95dfd1918c706360fbfb77e30189711627568009b56be8c116031aea",
"ledger": 7644807,
"envelope_xdr": "AAAAACcWoLAheccDU7Opac+lPuZHLhwl+m7VdKUkRluMnW8/AAAAZAByEfoAAAAXAAAAAAAAAAAAAAABAAAAAAAAAAEAAAAAoQjCnBcMBZYJlTroaqbohLAlzder4b0HfQ/nhrRdEwsAAAAAAAAAAUrOR4AAAAAAAAAAAYydbz8AAABA5muU1oeSmjocQGEvt2CiBkDc13ZRBA2HzrDumay09bHADiEcUVrTW0uZQtvaWQZ7fFwCi7LpCWTc1G50d597BQ==",
"result_xdr": "AAAAAAAAAGQAAAAAAAAAAQAAAAAAAAABAAAAAAAAAAA=",
"result_meta_xdr": "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"
}