11.4beta has PAC instruction in arm64 code

Hello
I have found that pthread_jit_write_protect_np (in macos 11.4beta) has first instruction - "pacibsp"
it's part of pointer auth code from arm64e, but the binary is arm64, not arm64e.

Just want to understand if it's some leftover or intended behaviour ?
11.4beta has PAC instruction in arm64 code
 
 
Q