This is a common issue involving the DPI mismatch during handoff from the EFI framebuffer early in the Plymouth boot process to the GPU drivers at the end. It happens on many devices. You can disable this to have Plymouth only appear once the GPU drivers are loaded. It results in a black screen until the LUKS prompt appears then the Plymouth animation continues as normal after entering the passphrase. You can also attempt to override the scaling during boot time.
More info can be found here
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@remagynona, thanks. I wouldn’t mind if the boot process waited for the GPU drivers to be initialised, but that method seems like it would delay my ability to see the DMesg logs at boot, which I care about more than mistyping my LUKS password.
Is there a Plymouth bug for this? I would presume not, considering it looks like it’s in the EFI’s hands, but I’ll search around. I don’t mind taking this to Framework if it’s an implementer fault, or the UEFI Forum if it’s a lack in the specification.