The Bug
The part of tripwire within the blockspace of a tripwire hook, is rendered solid opaque, in contrast with tripwire blocks which are translucent.
The reasoning for this is likely very much the same as what's behind MC-13187 - neither minecraft:water_cauldron
nor minecraft:tripwire_hook
are called as blocks which can use translucent rendering like for example minecraft:ice
can.
Very closely relates to MC-13187 and somewhat to MC-94331.
How to reproduce
Place two tripwire hooks one block apart from each other
Place string in between
❌ notice that there is a transparency transition between the tripwire and tripwire hook blocks
Related issues
Attachments
Comments

Can confirm.
Can confirm in 21w06a.