The resource pack attached to MC-214686 offers a complete fix for this issue. Mojang have my full permission to (and are encouraged to) replace the affected vanilla model files with the contents of the resource pack.
The bug
Redstone comparator models define faces for the bottoms of unlit redstone torches, despite these never being visible without clipping into the comparator itself. Powered torches correctly omit such faces due to not using a single cuboid.
How to reproduce
Place down an unpowered redstone comparator
Enter Spectator mode
Fly into the comparator such that the bottoms of the torches are in view
Expected behaviour
The unpowered torches would not have any bottom faces defined since such faces are never possible to see in normal gameplay.
Actual behaviour
These bottom faces are defined anyway, bloating the model file and forcing the game to render useless faces.
How to fix
The resource pack attached to MC-214686 fixes this issue completely.
Related issues
is duplicated by
relates to
Attachments
Comments

Can confirm in 20w49a.
Can confirm in 20w51a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 1.16.5 and 21w08b.
Can confirm in 21w15a.
Can confirm in 21w16a.
Can confirm in 1.17.

Can confirm in 1.17.1.
Can confirm in 1.18.
Can confirm in 1.18.1.
Can confirm in 1.18.2.
Can confirm in 1.19.
Can confirm in 1.19.2.

24w33a fixes this