It it just me or is the #JOSM Mapillary plugin demanding a version of JOSM that hasn't been released yet?
Version >=1817 requires non-stable JOSM-version · Issue #250 · JOSM/Mapillary

plugin version 1817/1818 require JOSM version 19528 v1816...v1817 Current stable JOSM version is 19481 Please do not roll out in JSOM extension manager before stable JOSM version is full-filling th...

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@HirschKauz They're really going with: "It's not our fault we broke it"?