Message "[error] bad format: unknown value appeared ..." is displayed twice

[agoodlife]

when parsing
MyKey = [wrong]

with toml::parse

e.what() contains the error twice:

[error] bad format: unknown value appeared
 --> /mathworks/devel/sandbox/abonnevi/workspace/bash/2026_05_21_toml/invalid.toml.pscfg
   |
 1 | MyKey = [wrong]
   |          ^-- here
[error] bad format: unknown value appeared
 --> /mathworks/devel/sandbox/abonnevi/workspace/bash/2026_05_21_toml/invalid.toml.pscfg
   |
 1 | MyKey = [wrong]
   |          ^-- here

NOTE: this has something to do with this specific error because when parsing
MyKey
The error only appears one.