lzma d "2_axZ.section_header_fixed" "3_axZ.section_decompressed"
The problem is that decompressed size less of the size specified in the header => i got after decompress 10624885. But I am sure that the section is not fully unpacked, because dumped from memory variant section size just is ~12800000+-.
I tried using lzma_dynamic and lzma2_dynamic on offset 0xc and various other offsets without luck. The good thing of lzma_dynamic is that it tries ALL the available lzma modes (all those you see in quickbms.txt) so it should be able to get the working one in any case and without limits of uncompressed size.