Cppcheck 2.18 - False Positive - Misra 5.8

[Jan Joseph]

Cppcheck is triggering 5.8 for struct member with the same name as external identifier in a erratic manner (sometimes it throws the error, sometimes it doesn't)

struct A { int size; };
extern struct B size;

Since the vars are in different namespaces this should be MISRA 5.8 compliant.

[Jan Joseph]

Sorry, I forgot to mention the CLI command

cppcheck --enable=all \
--inconclusive \
--std=c99 \
--addon=misra.json \
--language=c \
--platform=native \
--inline-suppr \
--verbose \
--check-level=exhaustive \
--project=compile_commands.json \
--suppressions-list=suppressions.txt \
--xml --xml-version=2

with misra.json being

{
  "script": "./misra.py",
  "args": [
    "--rule-texts=./misra.txt"
  ]
}

Since the actual file structure is a bit complicated I tried to reproduce the behaviour in a pseudo code.
file_A.h

struct A { int size; };

file_B.h

extern struct B size;

While struct B is defined in file_C.h with the error coming up in the above mentioned lines.
Please let me know if any info is missing. Thanks!