If a layer's symbology in the "Categorized" style refer to field names by wrapping in double-quotes, the map (and map preview) will be blank. This is true regardless if only I reference one field or if I use an expression. Importantly, using "Rule-Based" symbology does not cause the issue.

Reproduction steps:

1. qgis2web 3.22; qgis 3.38.1
2. Have any layer in the categorized style of symbology.
3. Instead of the field drop-down, manually type the field name "like_so".
4. The layer being marked for export will cause the map and preview to be blank. Unchecking the export box for this layer will restore the preview and export.