Is block--modifier wrapping the block OK?

[davidjgonzalez]

I am working within the constraints of a CMS that "wants" to generate HTML in this format:

<span class="my-component--xmas">
     <div class="my-component"> ... </div>
</span>

Effectively the span (block--modifier) is dynamically injected by the CMS, and the div (block) and everything therein is defined by developers.

IIUC, the ideal application would be

<div class="my-component my-component--xmas"> ... </div>

but that being said, are there risks/inefficiencies following the approach where the block--modifier wraps the block element? Is this considered a violation of the BEM methodology?

@floatdrop / @varya / @iamstarkov thoughts?