here are 2 /boot that fail
rpi02:~ # ll /boot
total 107188
-rw-r--r-- 1 root root 65 Mar 22 19:59 .Image-5.3.18-150300.59.60-default.hmac
-rw-r--r-- 1 root root 65 Apr 6 07:30 .Image-5.3.18-150300.59.63-default.hmac
lrwxrwxrwx 1 root root 33 Apr 13 10:50 Image -> Image-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 26333696 Mar 22 19:59 Image-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 26399232 Apr 6 07:30 Image-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 5212387 Mar 22 17:43 System.map-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 5214943 Apr 6 05:09 System.map-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 1725 Sep 22 2021 boot.readme
-rw-r--r-- 1 root root 255917 Mar 22 16:33 config-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 255917 Apr 6 04:01 config-5.3.18-150300.59.63-default
drwxr-xr-x 4 root root 16384 Dec 31 1969 efi
drwxr-xr-x 6 root root 4096 Apr 13 11:46 grub2
lrwxrwxrwx 1 root root 34 Apr 13 10:50 initrd -> initrd-5.3.18-150300.59.63-default
-rw------- 1 root root 11720256 Apr 12 14:33 initrd-5.3.18-150300.59.60-default
-rw------- 1 root root 11720044 Apr 13 10:51 initrd-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 11 Jul 27 2021 mbrid
-rw-r--r-- 1 root root 452396 Mar 22 17:54 symvers-5.3.18-150300.59.60-default.gz
-rw-r--r-- 1 root root 452419 Apr 6 05:19 symvers-5.3.18-150300.59.63-default.gz
-rw-r--r-- 1 root root 377 Mar 22 17:54 sysctl.conf-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 377 Apr 6 05:19 sysctl.conf-5.3.18-150300.59.63-default
drwxr-xr-x 3 root root 4096 Nov 24 07:47 vc
-rw-r--r-- 1 root root 10825803 Mar 22 18:09 vmlinux-5.3.18-150300.59.60-default.gz
-rw-r--r-- 1 root root 10834233 Apr 6 05:32 vmlinux-5.3.18-150300.59.63-default.gz
rpi02:~ #
not booted yet so this is before the boot that fails
rpi03:~ # ll /boot
total 160724
-rw-r--r-- 1 root root 65 Mar 7 07:42 .Image-5.3.18-150300.59.54-default.hmac
-rw-r--r-- 1 root root 65 Mar 22 19:59 .Image-5.3.18-150300.59.60-default.hmac
-rw-r--r-- 1 root root 65 Apr 6 07:30 .Image-5.3.18-150300.59.63-default.hmac
lrwxrwxrwx 1 root root 33 Apr 13 10:50 Image -> Image-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 26333696 Mar 7 07:42 Image-5.3.18-150300.59.54-default
-rw-r--r-- 1 root root 26333696 Mar 22 19:59 Image-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 26399232 Apr 6 07:30 Image-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 5212266 Mar 7 05:44 System.map-5.3.18-150300.59.54-default
-rw-r--r-- 1 root root 5212387 Mar 22 17:43 System.map-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 5214943 Apr 6 05:09 System.map-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 1725 Sep 22 2021 boot.readme
-rw-r--r-- 1 root root 255915 Mar 7 04:55 config-5.3.18-150300.59.54-default
-rw-r--r-- 1 root root 255917 Mar 22 16:33 config-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 255917 Apr 6 04:01 config-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 0 Apr 13 10:50 do_purge_kernels
drwxr-xr-x 4 root root 16384 Dec 31 1969 efi
drwxr-xr-x 6 root root 4096 Apr 13 10:52 grub2
lrwxrwxrwx 1 root root 34 Apr 13 10:50 initrd -> initrd-5.3.18-150300.59.63-default
-rw------- 1 root root 11720256 Apr 12 14:32 initrd-5.3.18-150300.59.54-default
-rw------- 1 root root 11720208 Apr 12 14:33 initrd-5.3.18-150300.59.60-default
-rw------- 1 root root 11719960 Apr 13 10:52 initrd-5.3.18-150300.59.63-default
-rw-r--r-- 1 root root 11 Jul 27 2021 mbrid
-rw-r--r-- 1 root root 452396 Mar 7 05:50 symvers-5.3.18-150300.59.54-default.gz
-rw-r--r-- 1 root root 452396 Mar 22 17:54 symvers-5.3.18-150300.59.60-default.gz
-rw-r--r-- 1 root root 452419 Apr 6 05:19 symvers-5.3.18-150300.59.63-default.gz
-rw-r--r-- 1 root root 377 Mar 7 05:50 sysctl.conf-5.3.18-150300.59.54-default
-rw-r--r-- 1 root root 377 Mar 22 17:54 sysctl.conf-5.3.18-150300.59.60-default
-rw-r--r-- 1 root root 377 Apr 6 05:19 sysctl.conf-5.3.18-150300.59.63-default
drwxr-xr-x 3 root root 4096 Nov 24 07:47 vc
-rw-r--r-- 1 root root 10825338 Mar 7 05:58 vmlinux-5.3.18-150300.59.54-default.gz
-rw-r--r-- 1 root root 10825803 Mar 22 18:09 vmlinux-5.3.18-150300.59.60-default.gz
-rw-r--r-- 1 root root 10834233 Apr 6 05:32 vmlinux-5.3.18-150300.59.63-default.gz
rpi03:~