Here's a stripped down version of the file. It looks fine in 2.82a. Display is broken in 2.3 beta. But the data is still there. If you go into Edit mode, you can see it. Just not in object mode.

Thanks!

rB6da097136cf4: Fix T59271: Curves with Extrude still show curve
CC @Philipp Oeser (lichtwerk)

Well, this obviously goes away if the 2D curves are not filled [Properties Editor > Curve > Shape panel > Fill Mode set to None]
In this file some parts of the curve object generate faces [due to success in filling] and some others dont [where filling isnt possible].

rB6da097136cf4 disabled the wires/curves drawing whenever any faces would be generated (looks like this is a bit too 'agressive')
I think the goal should be to draw wires/curves for all parts that dont generate faces and dont draw them if we have faces.
Need to find a way to do this not on a per-object basis, but on a per-spline basis?
(there can always be splines that generate faces due to filling/extrude/etc and splines that dont in a single object)

If this turns out to be problematic to implement, it might be better to always draw curves/wires and faces at the same time...

CC @Jeroen Bakker (jbakker)

I feel like this needs a design decission:

• in which cases do we draw faces / wires / both ?
• we could go with both (always): this report (T76196) would be closed, T59271 would be Invalid instead of resolved
• we could keep as is (only draw wires if we dont have any faces) -- but make an exception for 2D curves with a Fill Mode other than None?

For the second case, see D7594: Fix T76196: Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrude/etc]

All good points. The reason this seemed like a bug to me is that I loaded in a curve object and didn't see all the curves.

The first thing I did was switch from Solid viewport rendering to Wireframe rendering, with the expectation that if this was a fill issue, Wireframe shading would reveal that. That's how Adobe Illustrator works. You have a Wireframe "Outline" view mode and a Solid "Preview" view mode that removes any fills and just shows the raw vectors.

It seems to me that the solution is this:

If a curve object's Fill Mode is set to anything other than "None," it should attempt to fill (where applicable) in Solid shaded mode.
If a curve object's Fill Mode is set to anything other than "None," it should NOT fill when in Wireframe shaded mode.

Wireframe shaded view takes away the polygons fill and only leaves the edges. It should do the same thing for curves.

Any follow up to this? I tried loading the provided sample into the latest build (5/27/2020) and it's still not displaying correctly, whereas it does in 2.82a.

In T76196#921660, @Steve Warner (stevewarner) wrote:

All good points. The reason this seemed like a bug to me is that I loaded in a curve object and didn't see all the curves.

The first thing I did was switch from Solid viewport rendering to Wireframe rendering, with the expectation that if this was a fill issue, Wireframe shading would reveal that. That's how Adobe Illustrator works. You have a Wireframe "Outline" view mode and a Solid "Preview" view mode that removes any fills and just shows the raw vectors.

It seems to me that the solution is this:

If a curve object's Fill Mode is set to anything other than "None," it should attempt to fill (where applicable) in Solid shaded mode.
If a curve object's Fill Mode is set to anything other than "None," it should NOT fill when in Wireframe shaded mode.

Wireframe shaded view takes away the polygons fill and only leaves the edges. It should do the same thing for curves.

Put up D7874: Fix T76196: Curve Display hides wires as soon as any part has faces [due to filling/extrude/etc] for review which does this