@andybjackson @FanOfOpenWRT @p.p @IMEVER I hope that's all of you who reported the issue of packages like libustream* disappearing on upgrade.
The PR got committed and propagated into snapshots, so should appear in the next day or two.
You're looking specifically for the rpcd-mod-rpcsys package to bump up to 2025.09.30:
$ apk update
$ apk list rpcd-mod-rpcsys
rpcd-mod-rpcsys-2025.08.09~1905e096-r1 x86_64 {feeds/base/package/system/rpcd} (ISC) [installed]
rpcd-mod-rpcsys-2025.09.30~d4fa1474-r1 x86_64 {feeds/base/package/system/rpcd} (ISC)
Once you see that 2025.09.30 version, then upgrade it manually and you shouldn't see the packages disappear in your next owut upgrade.
$ apk upgrade rpcd-mod-rpcsys
Note that this bug would have also manifested in the LuCI Attended Sysupgrade app, as both it and owut are using the same rpcsys mechanism to build their package lists...
Thanks to @daniel for pushing this into the builds so quickly.