Minecarts fail to display specific blocks which you can specify in DisplayState.
One of the blocks they don't display are skulls.
Test this with:
summon minecart ~ ~ ~ {CustomDisplayTile:1b,DisplayState:{Name:"minecraft:skeleton_skull"}}
[media] and this summons a Minecart with all the correct data as you would expect.
However the skull isn't rendering at all.
This is also the case for e.g. banners.
Summon command:
summon minecart ~ ~ ~ {CustomDisplayTile:1b,DisplayState:{Name:"minecraft:blue_banner"}}
⚠️ List thus far of affected blocks which are not displayed (haven't checked all of them yet):
Skulls
Signs
Banners
Liquids (Water, Lava)
End Gateway
End Portal :info: Note: It does display the Nether Portal Block though, but Nether Portal Blocks are rendered differently
Book on enchanting table
It could be that this is due to skulls, signs, banners, end gateway and the book on enchantment table are block entities which are rendered via block entity renderer, but then again there are special cases such as e.g. chest, trapped chest, enderchest, shulker box which are displayed normally.
A more complete list of affected blocks - if there are any more than those mentioned - will be added over time.
Related issues
relates to
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Are you trying to make flying skulls or what?

@Djfe kinda the good thing about minecarts is the custom rotations.

15w43a

Confirmed for
1.9-pre2
Also for water and lava

@unknown I didn't fiddle much with those kinds of Minecarts, neither in 1.8.x nor 1.9 snapshots, but are you sure that water/lava are "blocks" are displayable at all?
Water, lava or fire are technical blocks, so from my gut feeling I'd say that you can't display them is "WaI".
which reminds me that skulls are also technical blocks if I recall correctly ;-;
If that is the reason, then it makes sense, but I got no idea, so someone from Mojang would have to tell us if that is "Works as intended"/"Won't fix".

None of those are technical blocks, some of them use only special renderer and fire renders correctly

I badly worded ;-; I meant I assumed a correlation that they removed them as (manually placeable) items (minus the skulls) you can get into your inventory.
I hope it's only a bug, would be awesome to have them as display tile }=)

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.

Still happens in 1.16.4. These blocks use special rendering, which is probably why they don't render in minecarts. (Heads and a few other blocks use entity models instead of normal block models. Liquids use special models generated in code.) I'm not sure if this will be fixed, we'd have to wait and see what someone from Mojang says.
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w07a.
Video attached.

Affects 21w18a

Confirmed for 1.17 pre-2, also affects banners, please add it to the description and title, or, in case there'd be even more than those 3, remove completely from title, but add to tags and description so people can find it.
There may be some other affected blocks, couldn't test everything yet.

I have agreed that with @unknown that this post should be transferred to her as I am no longer active on Mojira. Thanks

Affects 21w44a 1.17.1
Can confirm in 1.19.2.