This add-on reproduces a reported add-on issues:
https://issuetracker.google.com/issues/69270374
https://issuetracker.google.com/issues/144442251
https://issuetracker.google.com/issues/144443053

Reproducing overgrid image script issue:
Call menu Add-ons - Overgrid image assigned script - Insert overgrid image and click inserted image. 
Compare behavior with Add-ons - Overgrid image assigned script - Call function test.

Reproducing editor's add-on issue with multiple signed in accounts:
Sign-in to multiple Google accounts.
Under the last signed in account open any Google Sheet with this add-on Overgrid image assigned script:
Call menu Add-ons - Overgrid image assigned script - Show script user. 
Compare behavior with 
Add-ons - Overgrid image assigned script - Show HtmlOutput user and
Add-ons - Overgrid image assigned script - Show GoogleScriptRun user.