AMP Incompatibility Errors, CSS_SYNTAX_INVALID_PROPERTY_NOLIST

Trying to Make site AMP compatible and I’m getting a CSS_SYNTAX_INVALID_PROPERTY_NOLIST error. Can this be fixed in the plugin to make it compatible? I’m getting a lot of these errors throughout the site. Here are the details for just one:

"validation_errors": [
            {
                "code": "CSS_SYNTAX_INVALID_PROPERTY_NOLIST",
                "css_property_name": "behavior",
                "css_property_value": "url(\"#default#VML\")",
                "type": "css_error",
                "spec_name": "style amp-custom",
                "node_name": "link",
                "parent_name": "head",
                "node_attributes": {
                    "rel": "stylesheet",
                    "id": "leaflet-css",
                    "href": "[there is a link that originally goes here]",
                    "type": "text/css",
                    "media": "all"
                },
                "node_type": 1,
                "sources": [
                    {
                        "type": "plugin",
                        "name": "otter-blocks",
                        "file": "inc/class-registration.php",
                        "line": 265,
                        "function": "ThemeIsle\\GutenbergBlocks\\Registration::enqueue_block_assets",
                        "hook": "enqueue_block_assets",
                        "priority": 10,
                        "dependency_type": "style",
                        "handle": "otter-leaflet-map-style",
                        "dependency_handle": "leaflet"
                    },
                    {
                        "type": "plugin",
                        "name": "otter-blocks",
                        "file": "inc/class-registration.php",
                        "line": 158,
                        "function": "ThemeIsle\\GutenbergBlocks\\Registration::enqueue_assets",
                        "hook": "enqueue_block_assets",
                        "priority": 1,
                        "dependency_type": "style",
                        "handle": "leaflet"
                    }
                ]
            }
        ],