UE5.4.4 app crashes on iOS Tahoe 26.0

Development Platform & Builds
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Hi,

I recently updated both my Mac and iPhone to version Tahoe 26.0. Since then, I have been unable to run my apps on iOS built using UE5.4.4. This is the case whether I use Xcode 16.4 or version 26.0; the apps crash right after starting. I tested this with a new third-person view app created from the template. I tried to debug it in Xcode, too: when I open the generated xcodeproj file in Xcode and start the app from there, I receive the following error message:

“libc++abi: __cxa_guard_acquire detected recursive initialization: do you have a function-local static variable whose initialization depends on that function?

__cxa_guard_acquire detected recursive initialization: do you have a function-local static variable whose initialization depends on that function?”

UE5.6 works well on Tahoe 26.0 with Xcode 16.4. However, I cannot use UE5.5 or UE5.6 for my projects until issue UE-265363 has been fixed. Now I cannot use UE5.4 either.

Can anyone suggest a solution or workaround to enable me to build and run a UE5.4 project on Tahoe 26.0?

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Update: There is a case where an app cooked and packaged with UE5.4 works on iOS 26.0 devices. If one turns on the “For Distribution” switch in Project Settings, Project, Packaging, and sets the Build Configuration to Shipping, the app installed from the generated xcarchive file runs without any problems on both iOS 26.0 and 18.6. If “For Distribution” is false, it crashes on 26.0.

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Did you manage to find a solution for this? I’m having the same issue with iOS 26. Lightbake only works on 5.4 and 5.5 (On Mac); however, both versions have this issue. I packaged a project made in 5.7, and Xcode didn’t give me the “__cxa_guard_acquire detected recursive initialization” error.