Hi, hush aborts when doing mentioned parameter substitution. (Fortunately it works fine when double-quoted.)
$ ./hush
BusyBox v1.37.0.git (2023-06-04 12:42:18 CEST) hush - the humble shell
Enter 'help' for a list of built-in commands.
/tmp $ a=${a:+$a }a
/tmp $ echo $a
a
/tmp $ a=${a:+$a }a
hush: BUG in varexp2
hush-vars-var_subst.tests.fail
Description: Binary data
var_subst.right
Description: Binary data
var_subst.tests
Description: Binary data
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