Biblioteca does not load pages

[RobusTetus]

Opening Biblioteca installed from flathub produces following output and no website view.

MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:763: FINISHME: support YUV colorspace with DRM format modifiers
MESA-INTEL: warning: ../src/intel/vulkan/anv_formats.c:794: FINISHME: support more multi-planar formats with DRM modifiers
Failed to create /var/home/rob/.var/app/app.drey.Biblioteca/cache for shader cache (No such file or directory)---disabling.
Failed to create /var/home/rob/.var/app/app.drey.Biblioteca/cache for shader cache (No such file or directory)---disabling.
Failed to create GBM buffer of size 0x0: Invalid argument

PS: This gets fixed when opening new tab using plus button in the top right corner. New tab gets opened, working as expected, however tab opened upon program start-up is still blank. This happens every time the software is started.

[Revheim]

Open new tab does not solve the problem on my end.
The error messages in the console are:

src/nv_gbm.c:288: GBM-DRV error (nv_gbm_create_device_native): nv_common_gbm_create_device failed (ret=-1)
KMS: DRM_IOCTL_MODE_CREATE_DUMB failed: Permission denied
KMS: DRM_IOCTL_MODE_CREATE_DUMB failed: Permission denied
Failed to create GBM buffer of size 1520x1032: Permission denied

[konstantin-anori]

For me adding --env=GDK_BACKEND=x11 --env=WEBKIT_DISABLE_COMPOSITING_MODE=1 after the run command solved the issue

flatpak run --env=GDK_BACKEND=x11 --env=WEBKIT_DISABLE_COMPOSITING_MODE=1 app.drey.Bibiloteca