iOS 4.3 distribution binary no longer working with iPhone 3G/2nd Gen iPod Touch?

Does compiling with the iOS 4.3 SDK remove the support for the iPhone 3G and 2nd generation iPod touch devices?

After upgrading, I found that the ad-hoc and distribution builds no longer run on those devices, but installing the iOS 4.2 SDK to another directory, and performing no changes to the code or build settings, it does work correctly.

The application produces a crash report like the following:

OS Version:      iPhone OS 3.0 (7A341)
Report Version:  104

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000
Crashed Thread:  0

Thread 0 Crashed:
0   libobjc.A.dylib                 0x3014579c 0x3000c000 + 1283996

Thread 1:
0   libSystem.B.dylib               0x31d47158 mach_msg_trap + 20
1   libSystem.B.dylib               0x31d49ed8 mach_msg + 60
2   CoreFoundation                  0x3025454e CFRunLoopRunSpecific + 982
3   CoreFoundation                  0x30254164 CFRunLoopRunInMode + 44
4   WebCore                         0x3588dbc8 RunWebThread(void*) + 412
5   libSystem.B.dylib               0x31d705a0 _pthread_body + 20

Thread 0 crashed with ARM Thread State:
    r0: 0x00000000    r1: 0x00000000      r2: 0x39d4a928      r3: 0x00000113
    r4: 0x00114940    r5: 0x3893b29c      r6: 0x38204d80      r7: 0x0031acf0
    r8: 0x00000000    r9: 0x00000001     r10: 0x00000000     r11: 0x00000000
    ip: 0x39d802b8    sp: 0x2fffee10      lr: 0x3000852c      pc: 0x3014579c
  cpsr: 0x80000010

As can be seen, there is not a single reference in the stack trace to the actual application, and there are only the two threads running.

Is it documented anywhere that compiling for those older devices has been dropped? Is there any way to add some kind of build setting so that it does remain functional on those devices moving forward?

iOS 4.3 is not supported on devices older than iPhone 3GS and iPod Touch 3rd Gen (excluding the 8GB model, which is also not supported).

Source: Apple.com (scroll to bottom)