Parser text empty until selection made

Frequently, when going to a page for the first time, one or more sections controlled by a parser will be empty with the default choice. Upon changing the selection, text will appear. Switching back to the previously empty section reveals the text as it should have appeared.

No file, test, or entry point is named. Start by reproducing the first-load behavior on a page with parser-controlled sections, using the default choice before changing the selection; trace the JavaScript parser flow and compare it with the path triggered after a selection change. Done means the default selection displays its text on initial page load.

Written by the indexing model from the issue text.