Yes, there are a lot of caveats that should be warned about when changing rootfs partition size, but I haven't spent the time to dig it out. There are a couple of issues related to this on record, https://github.com/efahl/owut/issues Each platform has weird nuance and there's just no general way I can find to take apart the partitions to determine their type, size, file system and all that. I think I discuss some issue here, too: https://openwrt.org/docs/guide-user/installation/sysupgrade.owut#expanding_root_file_system
Add a --verbose whenever something seems missing, owut can be pretty chatty about things:
$ owut check -v
...
Default package analysis:
Default Provided-by
dnsmasq dnsmasq-full
kmod-drm-i915 not installed
kmod-dwmac-intel user ignored
libustream-mbedtls user ignored
nftables nftables-json
...
If you want that level of output all the time, just bump the value of verbosity to 1 in /etc/config/attendedsysupgrade, like this:
config owut 'owut'
option verbosity 1
option rootfs_size '256'
# option pre_install '/etc/owut.d/pre-install.sh'
option poll_interval 2000
list ignored_defaults 'kmod-dwmac-intel'
list ignored_defaults 'libustream-mbedtls'