In the inventory, some blocks are lit from the top left side and some from the top right.
Left-lit blocks include:
chests (plain, ender, trapped)
fences and walls
stairs
mob heads (except player and zombie heads, which are completely black)
beds
shulker boxes
Also, item sprites and GUI elements are still shaded as if lit from the left side.
Everything else is lit from the right.
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_zombiehunter
DelimanCZ
Everything should be lit from the top left side like in <1.14.4.
Fry
These inconsistencies also appear on custom item models, see screenshot (item shading.jpg). Compare for example item frames and rails (latter one too dark) or flower pots and bells (one shaded on the left, the other on the right). Tested with Better than Default v2.5.