[SM5] Error X4532 with POM Material

Until 4.8.1 POM works fine, but on 4.8.1 the following error occur:
“Error [SM5] error X4532: cannot map expression to cs_5_0 instruction set.”
Strange- in viewport of material editor the material is visualizated correctly, but can’t be saved.
4.8.1 for me is the worst release. The quality is drop so deep by some reason (Unity and CryEngine have original POM in their releases from years, but UE4 haven’t. It is absurd??? And how there are so many useless sample projects but absent some basic/critical materials- the priorities are so wrong …)