Please don't simply re-open bugs without consulting with the maintainer.
In your case, my understanding of cryptsetup is that it creates a
devmapper device exposing the *unencrypted* data on the partition. It
is quite correct that udev ignores /dev/sda4 - it is an encrypted swap,
and udev can do nothing with it.
Instead you should use the UUID of the actual unencrypted devmapper
device. What does ls -l /dev/mapper show for you?
** Changed in: udev (Ubuntu)
Status: New => Invalid
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udev fails to identify crypt_LUKS swap partition by uuid
https://bugs.launchpad.net/bugs/362315
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