Gasless transactions can't be confirmed (Confirm button is disabled)

[Karkunow]

Describe the bug
Metamask Mobile wallet doesn't work with gasless transactions. They can not be confirmed on mobile. On desktop, it works as expected.

Screenshots

To Reproduce
Steps to reproduce the behavior

1. Open Metamask mobile browser.
2. Go to https://pipeflare.io/flare2-token/spin or any other site which uses gasless transactions (https://aurora.plus/)
3. Connect your wallet (the connection happens via WalletConnect v2).
4. Click "Spin the wheel".
5. See transaction confirmation popup in Metamask mobile with the disabled "Confirm" button.
   (NOTICE: it doesn't reproduces on all devices, it seems. Some of my colleagues had it working, I've asked 5 different persons to try and it was 3 out of 5 who got the error).

Expected behavior
We expect to be able to confirm the transactions with 0 gas on Metamask Mobile app.

Smartphone (please complete the following information):

• Device: iPhone 13 Pro
• OS: iOS 16.6
• App Version: v.7.5.0(1167).

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to be added after bug submission by internal support / PM
Severity

• How critical is the impact of this bug on a user?
• Add stats if available on % of customers impacted
• Is this visible to all users?
• Is this tech debt?

[Karkunow]

Here is also the video of the screen while reproducing the bug:
https://www.youtube.com/shorts/pGyyUPyRxAw

[plasmacorral]

Hey @Karkunow, I am sorry for the difficulty here, but I want to thank you for taking the time to submit such a thorough report. We are currently tracking this under #6567 and I will share this new report with the team.