White, Crumbly Layer Under Mortar and Tile- what is it?
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I'm guessing, since it looks (and apparently behaves) like gypsum, that it is some kind of drywall material. It may have been used for leveling or soundproofing or maybe something to protect the wood from the mortar.
looks like plaster board
I agree it looks like sheetrock.
It's early Sheetrock. In its early form Sheetrock was installed in long planks then skim coated with plaster to fill in gaps and make it look Nice.