as you can see test2_veneer compiled/linked as non-thumb code.
00008028 <__test1_veneer>: 8028: f85f f000 ldr.w pc, [pc] ; 802c <__test1_veneer+0x4> 802c: 08000015 .word 0x08000015
00008030 <__test2_veneer>: 8030: f004 e51f ; <UNDEFINED> instruction: 0xf004e51f 8034: f0000001 .word 0xf0000001
as you can see test2_veneer compiled/linked as non-thumb code.
00008028 <__test1_veneer>: veneer+ 0x4>
8028: f85f f000 ldr.w pc, [pc] ; 802c <__test1_
802c: 08000015 .word 0x08000015
00008030 <__test2_veneer>:
8030: f004 e51f ; <UNDEFINED> instruction: 0xf004e51f
8034: f0000001 .word 0xf0000001