Did WordPress Recently Update the .htaccess Code?

I recently migrated a WordPress site to a TempServer so I could create a new theme, then migrate back with a new look and no down time.

When moving the site back after finishing, I got “Internal Error – Site cannot be displayed”, on every page except the Homepage.

I dug in to the .htaccess file and found this line of code causing the whole issue:

/RewriteBase.+/

I switched it back to the old code and everything came back:

RewriteBase /

I couldn’t find any reference to this new /RewriteBase.+/ statement, but I sure didn’t add it so I’m trying to get to the bottom of this so it doesn’t revert back. Any insight would be great, but the main problem has been resolved now.