advance() method is not working as expected

[harshgondaliya]

I am trying to advance the packet cursor by 8 bits using the code:
b.advance((bit<32>) 8).
This line of code is actually extracting the bits from the packet header and then
does not emit it back on the packet. I got to know this from the vivado.bash results.

Note: I am using a lookahead() method just before the advance().

[harshgondaliya]

Similar code (lookahead() followed by advance() ) worked well for v1model architecture.
But, it fails for sume_switch architecture.

[harshgondaliya]

I have created a sample P4 code to test the working of advance() method.
I have attached gen_testdata.py, commands.txt, and test-advance.p4 files as .txt file.

This is the ERROR output of ./vivado.bash
I think the cursor is not working properly.

[3351992]  INFO: packet 1 tuple OK < tuple_out_digest_data, tuple_out_sume_metadata > = < 0000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000004010012 >
[3351992] ERROR: packet mismatch in packet 1 cycle 0
expected (tlast, tkeep, tdata) = (1, 0003ffff, 0000000000000000000000000000030001000000010101010101020202020202)
actual   (tlast, tkeep, tdata) = (1, 0000ffff, 0000000000000000000000000000000003000000010101010101020202020202)

gen_testdata.py.txt
commands.txt
test-advance.p4.txt