The book model is very large in third person and on the ground and clips through the player's hands and the ground

The book points the wrong way when placed in an item frame, hiding the cover

Forge: 1.19.3-44.1.0
Guidebook: Guidebook-1.19.3-3.7.2

So, apparently in 1.19.3 the models don't seem to inherit the parent model "display" transforms. May or may not have been a bug in 1.19.2 also. Would need to check. Copypasting the transforms from the parent fixes this... 🤔

Should be fixed (worked around) as of 3.7.3