Deleting an entity from the viewers only deletes from 3D canvas, not stack browser

[dosumis]

e.g. in this scene, the fan-shaped body has been dropped from the control panel. It no longer shows on the 3D canvas but is still labelled in the stack browser:

[dosumis]

Console:
Instance created...
main.bundle.js:97 Adding FB - painted domain JFRC2 to 2
main.bundle.js:97 Passing 3 instances
/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 Passing instance: VFB_00030633
main.bundle.js:116 An import type has been resolved to a full type and swapped into the Geppetto model: 93.27001953125ms
/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 Colour change...
main.bundle.js:97 Adding FB - painted domain JFRC2 to 3
main.bundle.js:97 Passing 3 instances
/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 Colour change...
main.bundle.js:97 Adding FB - painted domain JFRC2 to 3
main.bundle.js:97 Passing 3 instances
main.bundle.js:96 unmount
4/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 Updating stack...
main.bundle.js:98 fan-shaped body clicked
/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 VFB_00030633 deleted...
main.bundle.js:97 Removing VFB_00030633 from 3
main.bundle.js:97 Passing 2 instances
/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 VFB_00030633 deleted...
main.bundle.js:97 Removing VFB_00030633 from 2
main.bundle.js:97 Passing 2 instances
/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 VFB_00030633 deleted...
main.bundle.js:97 Removing VFB_00030633 from 2
main.bundle.js:97 Passing 2 instances
/org.geppetto.frontend/geppetto/build/4.4.bundle.js:7 VFB_00030633 deleted...
main.bundle.js:97 Removing VFB_00030633 from 2

[Robbie1977]

Fixed