The namespace conversion to Flow on the WMF private officewiki processed several talk subpages assuming they would become Flow boards, but that didn't happen (T76772). We need to
- Idenfity those subpages.
- Evaluate which of those should be Flowified (e.g.a scratch test subpage need not be).
- Enable Flow on that subset.
- Manually repair the other talk subpages, e.g. move its Archive_1 sub-subpage back over it and leave it a regular wikitext page.
Until we enable T76778 the only way to enable Flow on a subpage is to add it to $wgFlowOccupyPages.