Problem when using multiple classes: only added the first one

[moodleulpgc]

Hi, we at ULPGC used this plugin with moodle 3.9 quite happily.
Now we have moodle 4.1, what we see is that the classes defined in config are shown on preview.
But when applied to editor text only the first class in the classes definition is really added. All after the first space is lost
For instance, a definition like
"classes": "badge badge-warning",
only applies
Badge info

whereas
"classes": "badge-warning badge ",
result in text in editor with only
Badge info

The effect is that regular bootstrap classes are missed