JOSM: Identify 1 member multipolygons during the closing validation procedure

In the process of slowly converting non-sensical multipolygons (before I knew of the follow/trace function) into simple polygons, sometimes miss to see an MP has just a single member left (see discussion) i.e. the outer ring, to do the reconstruct step in JOSM to convert to an SP. No disaster, the next day one of the QA sites will tell and then go back and do that step belated. Question is, is there a procedure in JOSM to catch these prior to upload the edits?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/josm-identify-1-member-multipolygons-during-the-closing-validation-procedure/106312