No member named reg_size

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I run into this error when running jeparse:
[shadow] parsing structures from memory... [shadow] 2021-08-13 21:59:53 Python Exception <class 'gdb.error'> There is no member named reg_size.: /tmp/NuGetScratch/pwnFZf_Yt.gdb:4: Error in sourced command file: Error occurred in Python: There is no member named reg_size.

I'm running jemalloc 2.2.5 standalone debug build and GDB 10.1.90.20210103-git with a python 3.9.2 interpreter.