Lorenzo, if your project aims to track deforestation in a timespan, IMHO you had better to focus on trees only. Trying to guess which landuse is going to replace trees is hard.
I'd start from an AOI entirely mapped with forest, wood or, in doubt, the generic landcover=trees all of which derived from not up-to-date imagery (ie Bing). With this baseline you can then alter polygons with fresh imagery (ie sentinel2). This implies to use OSM as an history container. It's up to you to find methods to save intermediate "snapshots". You can backup AOI periodically or maybe use planet diffs.
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