codes_new_from_message does not support multi-enabled grib2 messages

What happened?

I'm attempting to parse a grib2 file that, unfortunately, has multi-field grib messages encoded. A copy of the grib2 file from the RAP can be found here. I know that this feature is not recommended, but unfortunately, NCEP and other data providers have not heeded such advice. For multiple reasons, I need to be able to read the file through byte streaming, as described in this documentation. However, after a significant amount of time beating my head against a wall, I cannot get eccodes to properly handle byte stream messages that have multiple fields encoded. The only way I can get this to work is when using the codes_new_from_file API, and I cannot brute-force using BytesIO objects due to #25.

The motivation behind this is to fix an issue with the Kerchunk library currently being unable to parse multi-field messages. Since this is meant for scanning and reading byte ranges from cloud data sources, it is kind of crucial to be able to handle byte streams and parse a multi-field encoded message... but I'm increasingly getting the sense that the eccodes core library doesn't support this either.

I realize this issue may be rooted in the core eccodes library that this python repo wraps, but I wanted to start here first just in case. Is there anything I can do differently to achieve the desired functionality, or is Kerchunk's desire to read grib messages through byte streaming effectively unattainable?

Edit: I forgot to mention, calling eccodes.codes_grib_multi_support_on() before eccodes.codes_new_from_message(bytes(buf)) appears to have no effect.

What are the steps to reproduce the bug?

The message bytes in question:

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>\xd3l\xbe\xed}\xc4\xcd\xc3_\xdd\x84eUh\x92\xffz1\xc2\xc9\xf3"\xc6\xb2J\xee:\xc0Izz\xf4N3\x02\xf6\x16\xb8\x15\'B\x8d,1\xe1\x9b!\xd6\x9c\xd5VW)o\x
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XCH\xff\x7fR\xe7\xf3Te\xd1c{B\xfck}4\xea.\x88\x10}\xc3?\x8e\xa3X\x97\xd8x>\xaed\xd0\xf0Q\xf8\x8d\x08\x1c\x8f\x19)\xaf}\x9f\xf6\xee\xe0iJ\xf0\xe2\
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Version

2.36.0

Platform (OS and architecture)

Linux DESKTOP-5DTCKL2.attlocal.net 6.9.12-100.fc39.x86_64 #1 SMP PREEMPT_DYNAMIC Sat Jul 27 16:09:11 UTC 2024 x86_64 GNU/Linux

Relevant log output

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Accompanying data

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Organisation

NOAA

ecmwf / eccodes-python