macOS under M1, cannot find library

I’m looking for the following dylib file which is included from process loginwindow.

If I run vmmap to inspect loginwindow while it’s up and running I get :

user@mycomp / % sudo vmmap -I ``pgrep loginwindow`` | grep libIASUnifiedProgress.dylib

__TEXT                      1c7566000-1c756e000    [   32K    32K     0K     0K] r-x/r-x SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__DATA_CONST                1fdd05628-1fdd06438    [  3600   3600     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__DATA                      200ff1f18-200ff27b0    [  2200   2200     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__AUTH_CONST                207d4b260-207d4c008    [  3496   3496     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__OBJC_CONST                207d4c008-207d4c368    [   864    864     0K     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib
__DATA_DIRTY                20a5b9250-20a5b9460    [   528    528    528     0K] rw-/rw- SM=COW          /usr/lib/libIASUnifiedProgress.dylib

however, the file doesn’t appear to be there … I’m guessing it’s some new trick made by Apple, perhaps do you know how can I find it anyway ?

Thanks,