Transactions show as received instead of sent when Private spend key is missing

[nthpyrodev]

I setup Cupcake on an old phone I had, which I linked the Cakewallet on my second phone. When a transaction was sent, using the second phone, it incorrectly displayed the transaction as received rather than sent. This also showed as such in the total balance. (Briefly made me think I had doubled my XMR 😅)
I noticed that the transaction had a TX key of 0100000000000000000000000000000000000000000000000000000000000000
The transaction eventually showed itself as sent (within the same day) which was probably unrelated rescanning the blockchain multiple times.
I have sent more transactions to be sure, which all show correctly on the mobile Cakewallet, though with the invalid tx key I showed above.

I restored the wallet from the keys that the cakewallet on the phone had, which are the public spend key, public view key, private view key, and I also entered the primary wallet address. This currently has the same issue as the mobile wallet had where the sent transactions display as received on there, also adding to the total balance. Note that the sent (but displaying as received) transactions on the desktop wallet have no TX key.

After writing this issue, I rescanned the blockchain, and I noticed that both the mobile and desktop wallet now show a new received transaction of a bit under 2 XMR. After restoring in Feather, I can see that that was a smaller transaction I sent of around 0.001 XMR, again with the mobile wallet showing it with the tx key above, and the desktop wallet showing it with no tx key. So Cake is still showing sent transactions as received, and showing an incorrect amount sent/received.

I apologize if this issue is a bit confusing to follow, I'm not great at writing, but let me know if you'd like me to clarify anything.

Edit: Some (not all) previous transactions are back to showing as received rather than sent in the mobile wallet...

Platform:

• Mobile OS: Android 16 (Graphene OS)
• Mobile Device: Google Pixel 8 Pro
• Mobile Cake Wallet Version: 6.0.1
• Desktop Cake Wallet Version: 5.6.1 (Installed using flatpak file)

[MrCyjaneK]

The 0100... key is basically a placeholder for no key at all, as the key lives entirely on cupcake side so this is expected.

Are the transactions you are mentioning that show as received instead of sent self spent by any chance?

[nthpyrodev]

I'm curious as to why the mobile wallet finally showed the sent transactions as sent by itself after a few hours though.
I'm also assuming that if the txkey is 0100etc, then the wallet considers it an invalid key and shows it as received. This at least would be a bug that needs fixing?
No, all transactions are sent to another wallet, that displays everything correctly.

At the moment, I have to go off of feather to be sure what my balance is. To be clear, I'm restoring the cold wallet from seed with feather (which is not ideal at all), so perhaps feather would have the same problem if I were to not give it the private spend key.

Edit: Also the problem of showing an incorrect amount in a transaction that is nowhere near what I actually sent is odd. As I said in the issue, Cake is showing just under 2 XMR received when I only sent 0.001 XMR approximately.