I can't reproduce the issue anymore in the following versions. The feature works quite nicely.
texmacs 2.1.1 guix describe Generation 52 Dec 23 2021 11:56:54 (current) guix 037c2b6 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 037c2b6d3acdf7f5b68ecb3024ef90bce85922df --- Luis Felipe López Acevedo
publickey - luis.felipe.la@protonmail.com - 0x12DE1598.asc
Description: application/pgp-keys
signature.asc
Description: OpenPGP digital signature