Uncaught TypeError: L.DomUtil is undefined

@hax33l How did you import the lenis library?

Because of comment #3 this doesn't look a Leaflet module bug,
and anyway there is no clear proof/evidence of Leaflet module bug anyway
(things that don't work the way you expect don't naturally translate in a module bug ... but you should provide clear evidence it is a bug).

Hence changing this into Support Request ... (this clearly seems an issue in properly imposing js libraries in a specific Drupal instance setup).