404 on lazy loading gears.gif for script macros

Steps to Reproduce

• Configure a new Script Macro with the following groovy, to simulate a macro which takes a few seconds to load:

Thread.sleep(5000)
'<button>Hello <b>world</b></button>!'

• Enable Lazy Loading
• Save the macro and save the page
• View the page

Expected Result

Gears icon appears while macro is loading, followed by successful load.

Actual Result

The macro loads properly but while waiting, there is no gears icon due to a 404.

StackTrace

Failed to load resource: the server responded with a status of 404 () :4001/s/en_GB/7901/4635873c8e185dc5df37b4e2487dfbef570b5e2c/5.6.7/_/download/resources/com.onresolve.confluence.groovy.groovyrunner:lazy-loaded-macro-resources/gears.gif:1 Failed to load resource: the server responded with a status of 404 ()