Mistakenly blocking business info panel in Google Maps (sometimes)

[HundredsAnd100s]

When I block facebook.com in search results with this extension, the information panels for certain businesses disappear in Google Maps. I unblock facebook.com and the panels for those businesses stay open. This doesn't happen when your extension is disabled. And it doesn't happen when your extension is enabled but with an empty block list. I've tried blocking other sites as well but can't find one besides facebook.com that seems to cause this to happen.

I've found several businesses affected. But I've found several unaffected, too. I suspect some businesses have some kind of info in their panel that's causing your blocking rule to kick in.

To replicate:

• make certain facebook.com is not currently blocked by the extension
• go to maps.google.com
• search for "gravel edinburgh uk"
• click on MKM Building Supplies Edinburgh

A panel will open with details about the business; this is expected.

• search google.com for "Facebook"
• click the link "block facebook.com" to add it to the block list
• search maps.google.com for "gravel edinburgh uk" again
• click on MKM Building Supplies Edinburgh

The panel will not open.

• click Cemex UK in the same list of businesses

The panel for that business will open.

• remove facebook.com from the block list
• search maps for "gravel edinburgh uk" and click on MKM Building Supplies Edinburgh
• the panel for that business opens
• open a new tab, leaving the maps search results open
• search for facebook in the new tab and add it to the block list
• switch to the maps tab and refresh the page

The business panel will initially draw and then, after a second, disappear.