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(Cloudflare not accepting links in comments - again - ugh. This may not be the final answer.)

epan/wslua/wslua_pinfo.c

/* WSLUA_ATTRIBUTE Pinfo_in_error_pkt RO If we're inside an error packet. */
PINFO_NAMED_BOOLEAN_GETTER(in_error_pkt,flags.in_error_pkt);
...
    WSLUA_ATTRIBUTE_ROREG(Pinfo,in_error_pkt),

Yep, definitely read-only.
Can you copy the bytes to another TVB then call the ip dissector on that?