The dtb for the Zero 2 W is not included in the arm64 install media.
I don't have the hardware, but have checked that arm64 release still
fits with the following diff.

raspberrypi-firmware includes:
bcm2710-rpi-zero-2.dtb
bcm2710-rpi-zero-2-w.dtb

There is no publically released non-w model.
And bcm2710-rpi-zero-2.dts is just
#include "bcm2710-rpi-zero-2-w.dts"
https://github.com/raspberrypi/linux/blob/rpi-6.12.y/arch/arm/boot/dts/broadcom/bcm2710-rpi-zero-2.dts

start.elf seems to check for both names

Index: distrib/arm64/iso/Makefile
===================================================================
RCS file: /cvs/src/distrib/arm64/iso/Makefile,v
diff -u -p -r1.13 Makefile
--- distrib/arm64/iso/Makefile	1 Sep 2025 18:56:04 -0000	1.13
+++ distrib/arm64/iso/Makefile	2 Sep 2025 01:17:39 -0000
@@ -37,6 +37,7 @@ PIFILES=\
 	bcm2710-rpi-3-b.dtb \
 	bcm2710-rpi-3-b-plus.dtb \
 	bcm2710-rpi-cm3.dtb \
+	bcm2710-rpi-zero-2-w.dtb \
 	bcm2711-rpi-4-b.dtb \
 	bcm2711-rpi-400.dtb \
 	bcm2711-rpi-cm4.dtb \
Index: distrib/arm64/ramdisk/Makefile
===================================================================
RCS file: /cvs/src/distrib/arm64/ramdisk/Makefile,v
diff -u -p -r1.33 Makefile
--- distrib/arm64/ramdisk/Makefile	1 Sep 2025 18:56:04 -0000	1.33
+++ distrib/arm64/ramdisk/Makefile	2 Sep 2025 01:17:39 -0000
@@ -39,6 +39,7 @@ PIFILES=\
 	bcm2710-rpi-3-b.dtb \
 	bcm2710-rpi-3-b-plus.dtb \
 	bcm2710-rpi-cm3.dtb \
+	bcm2710-rpi-zero-2-w.dtb \
 	bcm2711-rpi-4-b.dtb \
 	bcm2711-rpi-400.dtb \
 	bcm2711-rpi-cm4.dtb \
Index: distrib/arm64/ramdisk/list
===================================================================
RCS file: /cvs/src/distrib/arm64/ramdisk/list,v
diff -u -p -r1.24 list
--- distrib/arm64/ramdisk/list	1 Sep 2025 18:56:04 -0000	1.24
+++ distrib/arm64/ramdisk/list	2 Sep 2025 01:17:39 -0000
@@ -107,6 +107,7 @@ COPY	/usr/local/share/raspberrypi-firmwa
 COPY	/usr/local/share/raspberrypi-firmware/boot/bcm2710-rpi-3-b.dtb usr/mdec/rpi/bcm2710-rpi-3-b.dtb
 COPY	/usr/local/share/raspberrypi-firmware/boot/bcm2710-rpi-3-b-plus.dtb usr/mdec/rpi/bcm2710-rpi-3-b-plus.dtb
 COPY	/usr/local/share/raspberrypi-firmware/boot/bcm2710-rpi-cm3.dtb usr/mdec/rpi/bcm2710-rpi-cm3.dtb
+COPY	/usr/local/share/raspberrypi-firmware/boot/bcm2710-rpi-zero-2-w.dtb usr/mdec/rpi/bcm2710-rpi-zero-2-w.dtb
 COPY	/usr/local/share/raspberrypi-firmware/boot/bcm2711-rpi-4-b.dtb usr/mdec/rpi/bcm2711-rpi-4-b.dtb
 COPY	/usr/local/share/raspberrypi-firmware/boot/bcm2711-rpi-400.dtb usr/mdec/rpi/bcm2711-rpi-400.dtb
 COPY	/usr/local/share/raspberrypi-firmware/boot/bcm2711-rpi-cm4.dtb usr/mdec/rpi/bcm2711-rpi-cm4.dtb