in reply to write() removes trailing spaces

There is nothing strange. The following altered code demonstrates that your $c variable contains 13 chars , which you want displayed within 11 space holders (1+10). Two chars werer choped, as per your request .
format STDOUT = @<<<<@<<<<@<<<<<<<<<<END $a, $b, $c . $a = "a"; $b = "b"; $c = "c .bc"; print 'len=',length $c; write(STDOUT);

Produces this output:

len=13 a b c .END

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