After installing new Edge iPad version 140+ the site cannot be displayed in iframe

Putting it here after discussion:

https://learn.microsoft.com/en-us/answers/questions/5560097/after-installing-new-edge-ipad-version-140-the-sit

Hello,

after installing Edge Version 140.0.3485.52 (Android and iOS): September 8, 2025 and newer on iPad our site cannot display iframe with weird command in Edge (Safari works, PC version works):

{"command":"registerAsChildFrameAck","remoteFrameId":"f2676238dc84d6ae727acdd8ae6c39e5"}

Screen of ERROR:

I was able to test it again on version 139+ and it was stable.

We tried:

• turn off every restriction from Intune - same error.
• add sites to Edge allowList - same error

We cannot find any decription or help on registerAsChildFrameAck.

I have very limited hands, cuz the problem is on device of bank.

Thanks,

Ian