Asymmetric ribbon @CA hide/show behavior

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The following bug report has been submitted:
Platform:        Darwin-18.7.0-x86_64-i386-64bit
ChimeraX Version: 1.1.1 (2020-10-07 08:32:49 UTC)
Description
show #3/A:435,623@CA target a does not show the CA atom in this morph but if I use show #3/A:435,623 target a to show the whole amino acid and then use hide #3/A:435,623@CA target a it will hide the CA atom. I don't understand why the same specifier works to hide the atom in question but not to show it

Log:
UCSF ChimeraX version: 1.1.1 (2020-10-07)  
© 2016-2020 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 5ljo

Summary of feedback from opening 5ljo fetched from pdb  
---  
warnings | Atom H is not in the residue template for LEU /B:22  
Atom H is not in the residue template for CYS /C:25  
Atom H is not in the residue template for GLU /D:26  
Atom H is not in the residue template for GLU /E:24  
Atom H is not in the residue template for PHE /A:24  
  
5ljo title:  
E. coli BAM complex (BamABCDE) by cryoEM [more info...]  
  
Chain information for 5ljo #1  
---  
Chain | Description  
A | Outer membrane protein assembly factor BamA  
B | Outer membrane protein assembly factor BamB  
C | Outer membrane protein assembly factor BamC  
D | Outer membrane protein assembly factor BamD  
E | Outer membrane protein assembly factor BamE  
  

> open 5d0o

5d0o title:  
BamABCDE complex, outer membrane β barrel assembly machinery entire complex
[more info...]  
  
Chain information for 5d0o #2  
---  
Chain | Description  
A | Outer membrane protein assembly factor BamA  
B | Outer membrane protein assembly factor BamB  
C | Outer membrane protein assembly factor BamC  
D | Outer membrane protein assembly factor BamD  
E | Outer membrane protein assembly factor BamE  
  

> hide #1,2 atoms

> show #1,2/A cartoons

> color #1,2/A rgb(0.252,0.680,1.000)

> color #1,2/B rgb(0.000,0.831,0.321)

> color #1,2/C rgb(1.000,0.861,0.137)

> color #1,2/D rgb(1.000,0.400,0.100)

> color #1,2/E rgb(0.780,0.000,0.400)

> view matrix models
> #1,1,0,0,0,0,1,0,0,0,0,1,0,#2,-0.82647,-0.51941,0.21716,224.85,-0.53861,0.61724,-0.57351,177.83,0.16385,-0.59096,-0.78989,191.81,#2.1,1,0,0,0,0,1,0,0,0,0,1,0

> color #1,2/A:424-447 green

> color #1,2/A:454-518 red

> color #1,2/A:348-423 dark orange

> morph #1,2 frames 40

Computed 41 frame morph #3  

> coordset #3 1,41

> show #3/A:435 target a

> show #3/A:623 target a

> set bgColor white

> lighting full

> view matrix camera
> -0.96342,-0.25909,0.068542,182.64,0.069143,0.0068015,0.99758,422.6,-0.25893,0.96583,0.011362,160.49

> hide #3/A:623 target a

> hide #3/A:435 target a

> show #3/A:435,623

> CA

Unknown command: CA  

> show #3/A:435,623@CA

> hide #3/A:435,623

> CA

Unknown command: CA  

> show #3/A:435,623@CA

> show #3/A:435,623@CA target c

> show #3/A:435,623@CA target c

> show #3/A:435,623@CA target c

> show #3/A:435,623@CA target c

> show #3/A:435,623@CA target c

> show #3/A:435,623@ca target c

> show #3/A:435,623@ca target c

> show #3/A:435,623@ca target a

> show #3/A:435,623@ca target atom

Invalid "target" argument: Target option can only include letters a = atoms, b
= bonds, p = pseudobonds, c = cartoons, r = cartoons, s = surfaces, m =
models, got t  

> show #3/A:435,623@ca target a

> show #3/A:435,623 target a

> show #3/A:435,623@CA target a

> show #3/A:435,623@CA target s

> hide #3/A:435,623@CA target s

> hide #3/A:435,623@CA target a

> hide #3/A:435,623

> show #3/A:435,623@CA target a

> show #3/A:435@CA target a

> show #3/A:435@CA




OpenGL version: 4.1 ATI-2.11.23
OpenGL renderer: AMD Radeon Pro 555X OpenGL Engine
OpenGL vendor: ATI Technologies Inc.Hardware:

    Hardware Overview:

      Model Name: MacBook Pro
      Model Identifier: MacBookPro15,1
      Processor Name: Intel Core i7
      Processor Speed: 2.2 GHz
      Number of Processors: 1
      Total Number of Cores: 6
      L2 Cache (per Core): 256 KB
      L3 Cache: 9 MB
      Hyper-Threading Technology: Enabled
      Memory: 16 GB
      Boot ROM Version: 1554.100.64.0.0 (iBridge: 18.16.14556.0.0,0)

Software:

    System Software Overview:

      System Version: macOS 10.14.6 (18G9028)
      Kernel Version: Darwin 18.7.0
      Time since boot: 4:38

Graphics/Displays:

    Intel UHD Graphics 630:

      Chipset Model: Intel UHD Graphics 630
      Type: GPU
      Bus: Built-In
      VRAM (Dynamic, Max): 1536 MB
      Vendor: Intel
      Device ID: 0x3e9b
      Revision ID: 0x0000
      Automatic Graphics Switching: Supported
      gMux Version: 5.0.0
      Metal: Supported, feature set macOS GPUFamily2 v1

    Radeon Pro 555X:

      Chipset Model: Radeon Pro 555X
      Type: GPU
      Bus: PCIe
      PCIe Lane Width: x8
      VRAM (Total): 4 GB
      Vendor: AMD (0x1002)
      Device ID: 0x67ef
      Revision ID: 0x00e3
      ROM Revision: 113-C980AL-075
      VBIOS Version: 113-C97501P-005
      EFI Driver Version: 01.A1.075
      Automatic Graphics Switching: Supported
      gMux Version: 5.0.0
      Metal: Supported, feature set macOS GPUFamily2 v1
      Displays:
        Color LCD:
          Display Type: Built-In Retina LCD
          Resolution: 2880 x 1800 Retina
          Framebuffer Depth: 24-Bit Color (ARGB8888)
          Mirror: Off
          Online: Yes
          Rotation: Supported
          Automatically Adjust Brightness: No
        PLG2888UH:
          Resolution: 5120 x 2880 (5K/UHD+ - Ultra High Definition Plus)
          UI Looks like: 2560 x 1440 @ 60 Hz
          Framebuffer Depth: 30-Bit Color (ARGB2101010)
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Rotation: Supported
          Automatically Adjust Brightness: No
          Connection Type: DisplayPort

PyQt version: 5.12.3
Compiled Qt version: 5.12.4
Runtime Qt version: 5.12.9
Installed Packages:
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[Eric Pettersen]

Reported by Samuel Haysom

[Tom Goddard]

The show and hide commands are not asymmetric. When a cartoon (ie ribbon) is shown then the backbone atoms including CA are not displayed. If you wish to show the backbone atoms and the cartoon at the same time which is a rather unusual style then use

cartoon #3 suppressBackboneDisplay false

as explained in the documentation here

​https://www.cgl.ucsf.edu/chimerax/docs/user/commands/cartoon.html

Alternatively you can hide the cartoon and show the backbone atoms

hide #3/A:435,623@CA target c
show #3/A:435,623@CA target a