Iron Bars and glass panes are rendered incorrectly when connected

Oh, well it was marked as having been fixed in the snapshot, and the wiki changelog also marked it as fixed (I suppose because of its fix version on here).

It still made more sense before. I mean it's iron bars, why's there a flat strip every block?

Don't know why it's reopened this much later, but confirmed for 20w13b, still looks stupid lol

Probably tricky to fix via models, so block states may need to be introduced.

Also, can I request ownership?

Affects 20w18a, can I request ownership?

Sorry, no.

Can confirm in 20w48a.

Can confirm in 20w51a.

Can confirm in 21w03a.

Can confirm in 21w05a.

Can confirm in 21w05b.

Can confirm in 21w06a.

Can confirm in 21w07a.

Can confirm in 21w11a.

Can confirm in 21w14a.

Can confirm in 21w17a.

Can confirm in 1.17.

Can confirm in 1.17.1.

I can confirm this behavior in 21w38a. Here are some extra details regarding this problem.

The Bug:

Iron bars and glass panes render their top and bottom faces when connected.

Steps to Reproduce:

• Summon a wall of iron bars and glass panes.

/fill ~1 ~ ~-1 ~1 ~2 ~-5 minecraft:glass_pane
/fill ~1 ~ ~1 ~1 ~2 ~5 minecraft:iron_bars

• Look at both the iron bars and glass panes closely.

• → ❌  Notice how iron bars and glass panes render their top and bottom faces when connected.

Expected Behavior:

The expected behavior would be that iron bars and glass panes would not render their top and bottom faces when connected.

Can confirm in 1.18.