behaviour of * version of somme theorem-like environment

[camus.philippe at free.fr]

Hello. 
Under Lyx 2.5.2 (archlinux), I get this behavior for some environment : the * version just print à dot, while the non * acts normally. 
As examples: defn* and thm* will print a dot, while xca* print "exercice" 
Is it a bug ? 
Philippe
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