Sometimes uses another theme
(filing this here although the source is likely plymouth itself): ever so often during boot i don't see the librem5 theme but a theme using 3 dots that fill from left to right. On next boot things are usually back to normal. Log does not look interesting to me:
# journalctl -b 0 | grep -i ply
Nov 02 17:00:05 pureos kernel: Kernel command line: ${console} console=ttymxc0,115200 quiet fsck.repair=yes security=apparmor splash plymouth.ignore-serial-consoles vt.global_cursor_default=0 root=/dev/mmcblk0p2
Nov 02 17:00:05 pureos kernel: imx8mq-usb-phy 381f0040.usb-phy: supply vbus not found, using dummy regulator
Nov 02 17:00:05 pureos systemd[1]: Started Apply Kernel Variables.
Nov 02 17:00:07 pureos systemd[1]: Starting Show Plymouth Boot Screen...
Nov 02 17:00:07 pureos systemd[1]: plymouth-start.service: Succeeded.
Nov 02 17:00:07 pureos systemd[1]: Started Show Plymouth Boot Screen.
Nov 02 17:00:07 pureos systemd[1]: Started Forward Password Requests to Plymouth Directory Watch.
Nov 02 17:00:07 pureos kernel: power_supply bq25890-charger: power_supply_get_battery_info currently only supports devicetree
Nov 02 17:00:08 pureos systemd[1]: Starting Show Plymouth Boot Screen...
Nov 02 17:00:08 pureos systemd[1]: plymouth-start.service: Succeeded.
Nov 02 17:00:08 pureos systemd[1]: Started Show Plymouth Boot Screen.
Nov 02 17:00:08 pureos systemd[1]: Starting Tell Plymouth To Write Out Runtime Data...
Nov 02 17:00:08 pureos systemd[1]: Received SIGRTMIN+20 from PID 203 (plymouthd).
Nov 02 17:00:08 pureos systemd[1]: plymouth-read-write.service: Succeeded.
Nov 02 17:00:08 pureos systemd[1]: Started Tell Plymouth To Write Out Runtime Data.
Nov 02 17:00:09 pureos systemd[1]: Starting Terminate Plymouth Boot Screen...
Nov 02 17:00:09 pureos systemd[1]: Received SIGRTMIN+21 from PID 203 (plymouthd).
Nov 02 17:00:09 pureos systemd[1]: Received SIGRTMIN+21 from PID 203 (plymouthd).
Nov 02 17:00:09 pureos systemd[1]: plymouth-quit.service: Succeeded.
Nov 02 17:00:09 pureos systemd[1]: Started Terminate Plymouth Boot Screen.
Nov 02 17:00:09 pureos systemd[1]: plymouth-quit-wait.service: Succeeded.
I had that on birch but blamed the fact that it used plymouth prior to the l5 theme but i'm also seeing this no dogwood with newer images.