Project 223874016: Stage 6th is shown differently between 2.0, 3.0 paint editor, and 3.0 stage

[apple502j]

Expected Behavior

All should be the same

Actual Behavior

All are different

3.0 Stage - very thin pillar and a bit longer

3.0 paint editor - length is good, but thin pillar

2.0 - best

Steps to Reproduce

1. Open https://scratch.mit.edu/projects/223874016/
   and https://llk.github.io/scratch-gui/develop/#223874016
2. Reach stage 6th, or change the "lvls"'s costume to 6th

Operating System and Browser

Windows 7 Home Premium 64bit
Firefox 60.0.1

[Kenny2github]

I can reproduce this on Chrome 66, Windows 10.

Appears on iPad through Chrome.

[adroitwhiz]

Looks fine for me w/ desktop Chrome and Firefox on Linux.