Summary:
Weeping vines cannot be placed underneath the following blocks:

• Stairs (Fixed in 1.19.10.20)
• Composter (Fixed in 1.19.10.20)
• Campfire (Fixed in 1.19.10.20)
• Trapdoor (Fixed in 1.19.10.20)
• Lectern (Fixed in 1.19.10.20)
• Sculk sensor (Fixed in 1.19.10.20)
• Sculk shrieker (Fixed in 1.19.10.20)
• End portal frame (Fixed in 1.19.60.20)
• Enchantment table (Fixed in 1.19.60.20)
• Shulker box (MCPE-169496)
• Stonecutter (Fixed in 1.20.0.20)
• Daylight sensor (Fixed in 1.20.0.20)

Steps to Reproduce:

1. Place the blocks listed above
2. Attempt to place weeping vines underneath them

Observed Results:
Weeping vines cannot be placed underneath those blocks.

Expected Results:
Weeping vines should be able to be placed underneath those blocks.

Screenshots:
Java: