Grep replace goes wrong near endnote reference

Hi,

While replacing the close quotes with GREP to one-by-one, its working fine. But useing replace all, the issue happen occuring, the same in coding also (Para breaking). Is this CC2020 bug or any connection with the endnote?

app.selection = NothingEnum.NOTHING;

app.findGrepPreferences = app.changeGrepPreferences = null; app.findChangeGrepOptions.includeFootnotes = true;

app.findChangeGrepOptions.includeHiddenLayers = false; app.findChangeGrepOptions.includeLockedLayersForFind = true; app.findChangeGrepOptions.includeLockedStoriesForFind = true; app.findChangeGrepOptions.includeMasterPages = false;

app.findGrepPreferences.findWhat = "(\\[LSQ\\].+?)~]";

app.changeGrepPreferences.changeTo="$1[RSQ]";

myFoundItems =app.documents.item(0).changeGrep();

Kindly guide and share if any alternate. Recorded file is attached for your reference. 

Thanks,

Selva