DejaVu - I think … TortoiseHg is not compatible with Mercurial 6.4
history is repeating itself - on mercurial changes - the tortoise hits an obstacle …
$ sudo pacman -Si mercurial
Repository : extra
Name : mercurial
Version : 6.5-1
Description : A scalable distributed SCM tool
Architecture : x86_64
URL : https://www.mercurial-scm.org/
Licenses : GPL
Groups : None
Provides : None
Depends On : python
Optional Deps : tk: for the hgk GUI
Conflicts With : None
Replaces : None
Download Size : 5,78 MiB
Installed Size : 35,23 MiB
Packager : Caleb Maclennan <alerque@archlinux.org>
Build Date : fre 07 jul 2023 09:33:32 CEST
Validated By : MD5 Sum SHA-256 Sum Signature
mercurial as a tool is available but there is no tortoise in Manjaro official repo - so you will need to rebuild your custom package.