Cannot read properties of undefined (reading 'MULTIPLE_OPTION_SEPARATOR') (v2025)

v2025
out of the blue.... on the porduction servers:
local dev machine, no issues

Uncaught TypeError: Cannot read properties of undefined (reading 'MULTIPLE_OPTION_SEPARATOR')
    at SelectionList.get (ewcore.js?v=25.12.25:974:38)

no other console errors except for this when you attempt to edit/add a record.
deleted the cache, js, src, models etc folders manually and copied from dev machine directly..

edit:
in the console, the variable is found....

i'm worndering as well, i enabled some new cloudflare rubbish that could be causing the issue, but i disabled CF and cleared the cache and the error still happens
any thoughts??

thanks
JS

resolved:
exactly as expected, some new Clouflare options that were enabled are causing the problem. disabled these items and site is operating as should.