In the frame of the development of surveypro (https://github.com/kordan/moodle-mod_surveypro) I pushed a branch to github.
In https://github.com/kordan/moodle-mod_surveypro/actions/runs/6244401346/job/16951247619 (using php 7.4)
or https://github.com/kordan/moodle-mod_surveypro/actions/runs/6235196000/job/16923914715 (using php 8)
I read:

test (7.4, MOODLE_401_STABLE, mariadb, default, default)
or
test (8, MOODLE_401_STABLE, pgsql, classic, chrome)

RUN  Mustache Lint on mod_surveypro
/home/runner/work/moodle-mod_surveypro/moodle-mod_surveypro/moodle/mod/surveypro/templates/view_action_bar.mustache
WARNING: ESLint warning [consistent-return]: Expected to return a value at the end of function. ( $('#url_select_test').on(CustomEvents.events.accessibleChange, function() {
                if (!$(this).val())

                $('#url_select_form').submit();
            });
        }); ), Line: 4 Column: 76
/home/runner/work/moodle-mod_surveypro/moodle-mod_surveypro/moodle/mod/surveypro/templates/view_action_bar.mustache
WARNING: ESLint error [no-trailing-spaces]: Trailing spaces not allowed. (  ), Line: 11 Column: 1
Error: Process completed with exit code 1.

The first warning is related to the core code in /lib/templates/url_select.mustache but forces non core tests (and maybe more) to fail.