whenever someone plasters over timber, the timber swells slightly and then shrinks back when dry. this leaves a hollow spot which usually cracks. don't be lazy, cut the wood back or out and cover with plasterboard or e.m.l. and backing plaster and skim.
trouble is cant cut out the wood because of the way its had to be done, may be able to put a sheet of plaster board on top but that would mean putting plasterboard on plaster which shouldnt be a problem, depends how it effects the levels of the wall
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