In general, if I write briefly through a translator.
there was version 23.05.5, an overlay was configured for 28 GB and a swap for 2 GB was created through luci-app-attendedsysupgrade to version 24.10.1 and both the swap and overlay disappeared.
it's incredibly annoying
That is likely not unexpected...
what is the target device? And what are you doing that requires such a large overlay? And generally, swap shouldn't be needed. Maybe some context would help.
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I figured out that each sysupgrade disables overlay, so first thing I do after boot is:
# uci set fstab.overlay.enabled=1
# reboot
Swap mounts automatically, as I have fstab.@global[0].auto_swap='1' set.