the 3 examples show similar cases where template-static-params.zul shows the expected result for all 3 cases:
AAA BBB CCC-ref DDD
AAA BBB
AAA BBB2
AAA
AAA CCC3

in both other*-nested.zul and *-nested2.zul the parameters of previous template invocations leak into the nested template, but slightly different

line 3 differs: the value "BBB2" of param2 is replaced by "BBB" from another invocation

AAABBBCCC3DDD
AAA BBB2 CCC3 DDD