When you restore the E_Tails wallet from seed, do you see
your test transaction?
Assuming you don't see it, I think it's most likely you somehow ended up with the wrong seed words. Or maybe you extended the seed phrase with your own password. Or your Windows may have been infected with
clipboard malware.
To make something clear: the seed is absoulute correct beacause I've used the same one to recover the "lost" wallet ----before I did the update---- and I did recover!
Well, it can't be. Unless you forgot the additional password: Electrum didn't change.
But even if it did change, why don't you just go back to the older Tails version and try from there?
Too little too late: I always
test a mnemonic before funding any address: I restore the wallet from seed and check if it gives the same address.