Comment # 2 on bug 1179625 from Stakanov Schufter

(In reply to Cliff Zhao from comment #1)
> Hi Stakanov:
> The recent update of plymouth should work together with the updated
> plymouth-branding-openSUSE package. Make sure you installed the latest
> edition of them both.
> Then, use
> ~> sudo plymouth-set-default-theme --rebuild-initrd bgrt
> to reset the theme.

Ok, I tried what you suggested but no luck. I am using trusted grub, encrypted
LUKS lvm. 
My packages:

entropia@roadrunner:~> sudo rpm -qi plymouth                                
[sudo] password di root: 
Name        : plymouth
Version     : 0.9.4+git20190304.ed9f201
Release     : lp151.2.3.1
Architecture: x86_64
Install Date: dom 13 dic 2020 09:27:56 CET
Group       : System/Base
Size        : 343754
License     : GPL-2.0-or-later
Signature   : RSA/SHA256, ven 26 lug 2019 06:13:54 CEST, Key ID
b88b2fd43dbdc284
Source RPM  : plymouth-0.9.4+git20190304.ed9f201-lp151.2.3.1.src.rpm
Build Date  : ven 26 lug 2019 06:13:28 CEST
Build Host  : cloud138
Relocations : (not relocatable)
Packager    : http://bugs.opensuse.org
Vendor      : openSUSE
URL         : http://www.freedesktop.org/wiki/Software/Plymouth
Summary     : Graphical Boot Animation and Logger
Description :
Plymouth provides an attractive graphical boot animation in
place of the text messages that normally get shown.  Text
messages are instead redirected to a log file for viewing
after boot.
Distribution: openSUSE Leap 15.1


entropia@roadrunner:~> sudo rpm -qi grub2
Name        : grub2
Version     : 2.02
Release     : lp151.21.30.1
Architecture: x86_64
Install Date: dom 15 nov 2020 14:14:08 CET
Group       : System/Boot
Size        : 22565016
License     : GPL-3.0-or-later
Signature   : RSA/SHA256, mer 11 nov 2020 14:20:21 CET, Key ID b88b2fd43dbdc284
Source RPM  : grub2-2.02-lp151.21.30.1.src.rpm
Build Date  : mer 11 nov 2020 14:19:06 CET
Build Host  : cloud133
Relocations : (not relocatable)
Packager    : http://bugs.opensuse.org
Vendor      : openSUSE
URL         : http://www.gnu.org/software/grub/
Summary     : Bootloader with support for Linux, Multiboot and more
Description :
This is the second version of the GRUB (Grand Unified Bootloader), a
highly configurable and customizable bootloader with modular
architecture.  It support rich scale of kernel formats, file systems,
computer architectures and hardware devices.

Finally:
entropia@roadrunner:~> sudo rpm -q trustedgrub2
trustedgrub2-1.4.0-lp151.3.1.x86_64

With this asset I am still matrix stile. (Maybe I am too bluepilled, the matrix
still has me).
Do you see any version that may cause this issue. I followed several time the
procedure, forced reinstall etc. No difference. 
All the rest before and after is normal. Splash package is:
sudo rpm -q libply-splash-core4
libply-splash-core4-0.9.4+git20190304.ed9f201-lp151.2.3.1.x86_64

entropia@roadrunner:~> sudo rpm -q libply-splash-graphics4
libply-splash-graphics4-0.9.4+git20190304.ed9f201-lp151.2.3.1.x86_64

Themes installed (I think by default are: bgrt, breeze and spinner.